It is the first time +that分句
在“It is/was/will be the first time+that分句”结构中，当主句动词为is/will be时，that分句动词一律用现在完成体，引导词that可以省略。例如：
It is the first time I’ve been here.
Don’t forget, it’ll be the first time I’ve spoken in public.
当主句动词为was时，that分句动词通常用过去完成体。例如：
It was the first time she’d been at a summer school and she thoroughly enjoyed it.

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