When you arrive at school,the first thing is to greet the teacher为什么不是greeting

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When you arrive at school,the first thing is to greet the teacher为什么不是greeting

When you arrive at school,the first thing is to greet the teacher为什么不是greeting
When you arrive at school,the first thing is to greet the teacher为什么不是greeting

When you arrive at school,the first thing is to greet the teacher为什么不是greeting
因为是 is to 后面必须接动词原形,表示一种将来,而且动作为人所控制.但不为人所控制的一种将来,不能用 be to,如 It's going to rain.要下雨了,这个就不能用 be to 来表示.

因为有to to do 短语作表语 greeting 表达类似的意思,不过从语感上最好是
greeting the teacher is the 1st thing when you arrive at the school.