第三人称单数的英文：
it.

"It" is the third-person singular neuter pronoun.
“it”是第三人称单数的中性代名词。

If you have a problem with the third person singular, try to concentrate on when you make such errors.
如果你的问题是在第三人称单数，那就尽力专注于你犯此类错误的时候。

An impersonal verb
无人称动词((时间、环境、距离等非特定主词以it表示的动词,常用第三人称单数;如It rains [snows,freezes].))