英文文法 短語phrase

你有D野搞錯左，verb 加 preposition 果D係 phrasal verb，唔係 phrase，個 verb 都仲係 verb，不過意思就同原來 verb 個意思有D唔同。
例子：
jump at an offer = accept an offer eagerly
call off the meeting = cancel the meeting
put off the meeting = delay the meeting
call on somebody = visit some body
wait on somebody = serve somebody at the table
仲有好多 phrasal verb

另一D verb 後有 preposition，個 phrase 係 verb 後面果D野，例如
from Hong Kong
to Hong Kong
個 verb 用法冇變。

咁佢用個時點解可能用are e.g. they are come from　ＨＫ.
呢句完全係錯
They are coming from HK.

通常are之後個動詞都要變動名詞 如they are going to HK,咁係吾係phrase就吾洗?
用 phrasal verb 或 verb，時態(tense)，agreement 都冇變，都要跟番文法，例如
They are going to Hong Kong.
They went to Hong Kong yesterday.
They are coming to Hong Kong.
Phrase 都不例外。

我想問如果verb加左preposition就有可能變左phrase,但係如果變左phrase,咁佢用個時點解可能用are e.g. they are come from　ＨＫ.

They are come from Hong Kong. WRONG ENGLISH!
They are from( preposition) Hong Kong.<---------Correct!
OR
They come( main verb) from Hong Kong. <--------Correct!
In English grammar, we cannot put " are" with " come" ( bare verb) like that in the sentence.

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