英语同义句1.To learn a foreign language is not esay .—— —— —— ——

英语同义句
1.To learn a foreign language is not esay .
—— —— —— —— to learn a foreign language
2.The policeman said to the boys “Don’play in the road"
The policeman—— the boys —— —— ——in the road
3.I don’t know when the meeting will begin
I don’t know —— —— —— the ——
4.We don’t know when the meeting will begin
there is noting —— —— —— —— ——