*The adverbs: now , at the moment

*The following verbs are never used in continuous forms:

+Verbs of perception(Các động từ về nhận thức):

see, hear, notice, recognize, smell, feel..

+Verbs of emotion(Các động từ về cảm xúc ): want, desire, refuse, forget, wish, care, love, hate, like, dislike..

+Verbs of thinking(Các động từ về suy nghĩ ): think, feel, relize, understand, know, mean, suppose, believe, remember, mind, recollect, recall, trust..

(-) I have not found my door keys yet.

(?) Have you ever met him before? Yes, I have./No, I haven’t.

(?) What have you just done?

(+) S + have/has + V(past participle)