The general purpose do has several uses. It is sometimes confused with the verb make. These words have similar meanings, but there are also a few differences.

Uses of do

Incorrect: He asked had we taken our food.
Correct: He asked if / whether we had taken our food.

Both can and could are modal auxiliary verbs. Can is used to talk about present or general ability. Could is used to talk about ability that existed in the past.

Adjectives with verbs

An adjective can be used with a verb when some quality of the subject, rather than the action of the verb is to be expressed.
Read the sentences given below:

Pronouns used as complements of to be

Grammarians formerly recommended that a pronoun used as the complement of the verb to be should be in the nominative case. Today the use of the nominative case in such cases is considered extremely formal and over-correct. Instead, we use the objective case.

Countable and uncountable nouns

Words like flower, book, tree, chair and pen are countable nouns because they refer to objects that can be counted. Countable nouns can have plural forms. They can also be used with numbers and the articles a/an.