疑问词加to do sth,作主语,作宾语作表语,各造一句怎么造

题目

疑问词加to do sth,作主语,作宾语作表语,各造一句怎么造

答案

1 what to eat is a question(主语)
2 I really don't know what to say(宾语)
3 the most important thing is how to get there.(表语)