We have seen that the past perfect tense is used to talk about a completed past action. Note that when two past actions have to be mentioned, the past perfect is used for the earlier of the two, and the simple past for the later.
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The tense of a verb shows not only the time of the action but also whether it is complete or not. There are three tenses in English:
The subject must agree with the verb in number and person. Basic rules of sentence agreement are given here.
The indefinite article (a/an) is used before a noun in the following cases:
a) To convey the numerical sense of one
I have a pen.
There is a cat on the roof.
A hundred kilos make a quintal.
Kinds of Sentences
A simple sentence consists of a single main clause.
She wrote a letter.
They visited us yesterday.
It is snowing.
We have been waiting for hours.
Good books build character.
Birds of a feather flock together.
A sentence is the largest grammatical unit in any language. In English, a sentence always contains a subject and a predicate.
A sentence is a group of words arranged in a specific order which makes complete sense.
There are different kinds of sentences and they are