NC L85 Paris in the spring

动词原形-动词单三-动词现在分词-动词过去式-动词过去分词

eat/eats/eating/ate/eaten

watch/watches/watching/watched/watched

am/is/are-was/were-been

现在完成时公式：

have/has + 动词过去分词

have dinner：

I have had dinner.

I have eaten an apple.

have been to + 地方      到过...

I have been to Beijing.

I have not been to Beijing.

Have you been to Beijing?

Yes, I have.  No, I haven’t.

all the time 一直

already/just/never

just like...