The present continuous tense is used to talk about an action that is going on at the time of speaking.

Form: subject + is / am / are + ing form of the verb

• It is raining.
• We are waiting.
• They are playing.
• She is writing.

The present continuous tense is often used to talk about a future action that has already been arranged.

• We are going to Mumbai tomorrow.
• He is arriving tomorrow.

Notes

There are a few verbs that are not normally used in the present continuous forms. Examples are: think, know, want, suppose, understand, remember, trust, agree, hear, see, smell, wish, desire, love, hate etc.

• I think you are right. (NOT I am thinking you are right.)
• I know I am wrong. (NOT I am knowing I am wrong.)

Related posts:

1. Present Tense
2. Simple present tense
3. Tenses