Understanding 'I Don't Know' in English

What is the primary phrase introduced in the lesson to express uncertainty?

• I am not sure

• I am uncertain

• I don't know

• I can't decide

Which of the following is NOT a correct use of 'I don't know' in the present tense?

• I don't know who went to his party.

• I don't know how to swim.

• I don't know who usually goes to his parties.

• I don't know what to say.

How can 'I don't know' be used in the past tense?

• I don't know who usually goes to his parties.

• I don't know who will go to his party.

• I don't know who went to his party.

• I don't know who is going to his party.

What is a stative verb?

• A verb that can be used in continuous form

• A verb that is always in past tense

• A verb that describes a state or condition

• A verb that describes an action

Which of the following sentences is incorrect?

• I don't know if I locked the door.

• I am not knowing if I locked the door.

• I don't know how to drive.

• I don't know whether Jane has arrived.