We must try
比如：To remember this is very important.
比如：It is very important to remember this.
比如：He seems to be ill.
剩意：不定式干表语首要拥有叁种情景，壹是用于seem, appear, prove等系触动词之后的不 定式（更是to be），
二是像My job is to sweep the floor. 此雕刻么的主语与表语“等价”的境地，
You are to come when I call.
比如：I can not afford to buy a car.
比如：I had no choice but to wait.
比如：I find it difficult to learn Japanese well.
比如：Who taught you to drive?
比如：I have a question to ask you.
剩意：拥局部名词（如way, chance, right等）后用干不定式却换成of doing sth.
如：It is the best way to do (of doing) it.
条是以下名词后接不定式干定语时畅通日不能换成of doing sth.
attempt courage decision effort fortune failure invitation wish
比如：I went to France to learn French.