Please tell me that "under" is what kind of word here.Thanks.
Here is the sentence: I know how much stress you've been under recently.

Which kind of word is the "under" here, prep , adv or adj?
By the way, is there any grammatical mistake in my question? It sounds weird.

Thank you for your help.

Question

Please tell me that "under" is  what kind of word here.Thanks.
Here is the sentence: I know how much stress you've been under recently.

Which kind of word is the "under"  here, prep , adv or adj? 
By the way, is there any grammatical mistake in my question? It sounds weird.

Thank you for your help.

Answer

As far as I know, "under" is always a preposition. In your sentence, this can be confusing because   the object (stress) is not a physical object, "under stress" is a little bit metaphorical.

Answer

Sorry, can't tell you what part of grammar 'under' is in this sentence - not my strong point.  But I can tell you that the correct way to phrase your question is - Please tell me what kind of word "under" is here.

Answer

In the above sentence, which parts of speech does the word under apply, "prep, adv, adj?"

Answer

In this sentence, "under" is not a preposition. "under" is an adjective.

Under means: subject to the control or effect of a person, drug, or force:(在…的控制之下)

I know how much stress you've been under recently. 我知道你最近承受着太大的压力。

When "under" is used as an preoposition, it describes the position or location and means you are "underneath some person or thing." (under the table)

When "under" is used as an adjective, it describes control or effect and means you are being control or effected by a person or thing. (The patient was under as soon as he breathed the anesthetic.)

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