Chen: Yes, actually. It turned out that the building's tenants never paid management fees. Sally: So the landlord never fixed the elevator? Chen: Exactly, and apparently it was broken for quite a while. Sally: Are the tenants being held responsible for the girl's death? Chen: There's a landlord and fifty-three families in the building, so it's a very complicated situation. Sally: I can imagine. What a tragedy! But this elevator should be fine, no? Chen: Do you trust the quality control here? I, sure as hell, don't. Sally: Good point. And leaning on things isn't so good for my posture anyway.
All artificial satellites get the energy they need by huge solar panels which extend like wings. These are therefore controlled in such a way that they are always turned toward the Sun.
现在完成时由have的现在式＋过去分词构成： I have worked等 规则动词的过去分词形式与过去式完全相同，如 loved，walked 等。 不规则动词的过去分词形式则各不相同，需要记住。 否定式由助动词后加not构成。 疑问式由倒装了的助动词与主语构成。 缩略形式： have／has和 have not／has not可以缩略： I've worked you haven't worked hasn't he worked？等 缩略形式在日常口语中说得很轻，经常是几乎听不见的。 Where've you been？ 你去哪儿了？ What's he done？ 他做了什么事？