It's a verb that makes complete sense by itself, as:

Active Voice, Passive Voice

There are two special forms for verbs called voice:

1. Active voice
2. Passive voice

The active voice is the "normal" voice. This is the voice that we use most of the time. You are probably already familiar with the active voice. In the active voice, the object receives the action of the verb:

active	subject	verb	object
		>
	Cats	eat	fish.

The passive voice is less usual. In the passive voice, the subject receives the action of the verb:

passive	subject	verb	object
	<
	Fish	are eaten	by cats.

The object of the active verb becomes the subject of the passive verb:

	subject	verb	object
active	Everybody	drinks	water.
passive	Water	is drunk	by everybody.

From: www.englishclub.com

Passive Voice

The passive voice is less usual than the active voice. The active voice is the "normal" voice. But sometimes we need the passive voice. In this lesson we look at how to construct the passive voice, when to use it and how to conjugate it.

Construction of the Passive Voice

The structure of the passive voice is very simple:

subject + auxiliary verb (be) + main verb (past participle)

The main verb is always in its past participle form.

Look at these examples:

Use of the Passive Voice

We use the passive when:

• we want to make the active object more important
• we do not know the active subject

Note that we always use by to introduce the passive object (Fish are eaten by cats).

Look at this sentence: He was killed with a gun. Normally we use by to introduce the passive object. But the gun is not the active subject. The gun did not kill him. He was killed by somebody with a gun. In the active voice, it would be: Somebody killed him with a gun. The gun is the instrument. Somebody is the "agent" or "doer".

Conjugation for the Passive Voice

We can form the passive in any tense. In fact, conjugation of verbs in the passive tense is rather easy, as the main verb is always in past participle form and the auxiliary verb is alwaysbe. To form the required tense, we conjugate the auxiliary verb. So, for example:

• present simple: It is made
• present continuous: It is being made
• present perfect: It has been made

Here are some examples with most of the possible tenses:

The subjunctive mood has almost disappeared from the language and is thus more difficult to use correctly than either the indicative mood or the imperative mood. The subjunctive mood rarely appears in everyday conversation or writing and is used in a set of specific circumstances.

You form the present tense subjunctive by dropping the "s" from the end of the third person singular, except for the verb "be".

paints

present subjunctive: "paint"

walks

present subjunctive: "walk"

thinks

present subjunctive: "think"

is

present subjunctive: "be"

Except for the verb "be," the past tense subjunctive is indistinguishable in form from the past tense indicative. The past tense subjunctive of "be" is "were."

painted

past subjunctive: "painted"

walked

past subjunctive: "walked"

thought

past subjunctive: "thought"

was

past subjunctive: "were"

The subjunctive is found in a handful of traditional circumstances. For example, in the sentence "God save the Queen," the verb "save" is in the subjunctive mood. Similarly, in the sentence "Heaven forbid," the verb forbid is in the subjunctive mood.

The subjunctive is usually found in complex sentences. The subjunctive mood is used in dependent clauses to express unreal conditions and in dependent clauses following verbs of wishing or requesting.

The subjunctive mood is used in a dependent clause attached to anindependent clause that uses a verb such as "ask," "command," "demand," "insist," "order," "recommend," "require," "suggest," or "wish."

The subjunctive mood is also used in a dependent clause attached to an independent clause that uses an adjective that expresses urgency (such as "crucial," "essential," "important," "imperative," "necessary," or "urgent").

Each of the highlighted verbs in the following sentences is in the subjunctive mood.

It is urgent that Harraway attend Monday's meeting.

The Member of Parliament demanded that the Minister explain the effects of the bill on the environment.

The sergeant ordered that Calvin scrub the walls of the mess hall.

We suggest that Mr. Beatty move the car out of the no parking zone.

The committee recommended that the bill be passed immediately.

If Canada were a tropical country, we would be able to grow pineapples in our backyards.

If he were more generous, he would not have chased the canvassers away from his door.

I wish that this book were still in print.

If the council members were interested in stopping street prostitution, they would urge the police to pursue customers more vigorously than they pursue the prostitutes.

The imperative mood is also common and is used to give orders or to make requests. The imperative is identical in form to the second person indicative.

The highlighted verbs in the following sentences are all in the imperative mood:

Pick up those boxes.

Fetch.

Close the window.

The indicative mood is the most common and is used to express facts and opinions or to make inquiries. Most of the statements you make or you read will be in the indicative mood.

The highlighted verbs in the following sentences are all in the indicative mood:

Joe picks up the boxes.

The german shepherd fetches the stick.

Charles closes the window

It requires a complement to complete sense, as:

It requires a complement to make complete sense, and since the complement refers to the objetive, it is called objective complement.

It's a verb that, together with its object makes complete sens, as:

Some verbs do not, by themselves, make complete sense, but they require some word or words that complete the sense. These latter are called "complements". Any verb that requires a complement is said to be of incomplete predication. Verbs that require no complement are said to be of complete predication.