I didn't mean to scare you.我不是有意要吓你

mean to:故意

Sorry, I didn't mean to frighten you.

对不起，我不是故意吓唬你的。

I just stopped by to drop that off.我只是顺路来送礼物

drop off:把…留下

I just came by to drop off your tank.

我只是把你的鱼缸送过来。

Could you drop off the books at the library?

你能把这些书顺便还给图书馆吗?

I didn't wanna leave it at the front door,我不想把东西放在前门那里

in front of:在 ... 前面

There is a rose bush in front of the office.

办公室前有一丛玫瑰。

I didn't do it to mess with your head.我不是故意要搅乱你生活的

mess with:干扰

Don't mess with her: she's got a violent temper.

别干预她的事，她脾气很暴。