I'm checking in with you in case dad calls from Syracuse.我先跟你報備一下，免得爸爸從錫拉庫扎市打電話來查崗

check in 登記；報到

I hope to check in for the next flight.

我希望登記乘下一班飛機。

You must check in the equipment after using.

這些器材用后必須辦妥手續歸還。

in case萬一，以防；如果

I have kept a reserve fund in case of accidents.

我已籌備了一筆準備基金以防不測。

Write the telephone number down in case you forget.

把電話號碼寫下來以免忘了。

Just don't wait up.別等我了

wait up等候著不睡

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

我今晚不回來了，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。