1.He has been making kites since 2 years ago.

问题描述:

1.He has been making kites since 2 years ago.
He has been making kites ______ 2 years .
It is two years ______ he ______ to make kites.
2.I am certain I will be here in time.
I am certain ______ ______ here in time.

1.for ;since began
2.to be