If you see litter in the corridor, pick it up.

如果你看到走廊里有垃圾，就把它捡起来。

《柯林斯英汉双解大词典》

If you see him, give him this note.

你要是见到他，就把这个便条给他。

《牛津词典》

See if you can stall her while I finish searching her office.

你看能不能拖住她，我好把她的办公室搜查完。

《牛津词典》

See a doctor if a mole bleeds, is bigger than six millimeters or you feel like rubbing it.

VOA: special.2010.07.06

And, I will have office hours today 30 starting at about 3:30 to 4:30 if you want to see me.

另外你今天如果想来见过的的话,我的办公时间是从3：30到4：

麻省理工公开课 - 固态化学导论课程节选

if you want to see some more, if you want to travel, so you need it absolutely.

如果你想见识更多，如果你想旅行的话，你绝对需要英语。

学习英语的理由 - SpeakingMax英语口语达人

"If you see the enemy, well, that's the enemy, but now if you see a kid with a gun you're going to think twice, " she said.

WSJ: Women in combat face doubts over emotions, ability

If you see something you like, buy it, otherwise it might not be available next week.

FORBES: 10 Steps for Surviving the Holidays

A. Not if you see--not if you had witnessed her emotional state and this "thing, " as I say.

CNN: Transcripts from video deposition of Lewinsky, Jordan, and Blumenthal