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Are these sentences correct?


a) "They say that when you are with a cold or the flu, you should ingest many liquids."


b) "They say that when you have a cold or the flu, you should ingest many liquids."


c) "They say that when you have a cold or the flu, you should drink many liquids."

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They're grammatical but not natural. If you want to sound like a native English-speaker, say

They say that when you have a cold or the flu, you should drink lots of water.

I thought you'd got into the habit of giving your threads good titles. 'Sentences' is useless, especially as you've given your earlier thread exactly the same useless title, A good title for this thread would have been 'a cold or the flu', and for the other, 'People shouldn't fret too much'.

Have you noticed that I'm only answering your questions when you use a question mark and not a colon after 'Are these sentences correct?'

Comments  
Christine Christiethe flu

The first word is not needed in British English.