I'm checking in with you in case dad calls from Syracuse.我先跟你报备一下，免得爸爸从锡拉库扎市打电话来查岗

check in 登记；报到

I hope to check in for the next flight.

我希望登记乘下一班飞机。

You must check in the equipment after using.

这些器材用后必须办妥手续归还。

in case万一，以防；如果

I have kept a reserve fund in case of accidents.

我已筹备了一笔准备基金以防不测。

Write the telephone number down in case you forget.

把电话号码写下来以免忘了。

Just don't wait up.别等我了

wait up等候着不睡

I won't be back tonight, so don't wait up for me.

我今晚不回来了，所以不用等我了。

Don't wait up for me: I shall be coming home very late.

不用等我,我要很晚才回家。