1.Would you like to play basketball with me?（play 改为to play 固定用法：would like to do sth )
2.There is an English book on the desk.（ HAS 改为is .这是THERE BE 结构）
3.Here's a gift for you,（ to 改为for）
4.Where are you from?（ 去掉come）
或
Where do you come from （are 改为do）
5.I'II let him know as soon as he comes back.
( come -> comes ; as soon as 引导的从句遵循‘ 主将从现’原则)
或
I 'll let them know as soon as they come back .( he 改为they）
注：前后主语要一致.
加油!不明白再问!