He doesn’t know when he should go there.(改为同义句)He doesn’t know________ ________go there.
We started to skate two hours ago.(对画线部分提问) ________ ________you start to skate?
He ran in the school for half an hour.(对画线部分提问) ________ ________ ________he run in the school?
Neither this answer nor that one is right.(改为同义句) ________ ________the answers________right.
I have been to the Space Museum.(对画线部分提问) ________ ________you________?
His sister went to Beijing last March and last October.She went to Beijing again last month.(改为同义句) His sister has been to Beijing________ ________since last March.