1. used to do 过去经常…，曾经…

He used to be my best friend, but now we are like strangers to each other.

他曾经是我最好的朋友，但现在我们彼此就像陌生人一样。

2. get/be used to +n/doing 习惯于…

used adj 习惯的

She just got here, and she’s not used to the food here yet.

她刚到这，对这里的食物还不习惯。

I used to run in the morning everyday, so I was used to getting up early.

我以前每天早晨都跑步，所以我习惯了早起。

3.   be used to do 被用来…

The water was used to water flowers. 这些水被用来浇花了。

读音

used to 连读