a) Both are possible and natural to me in everyday contexts (though possibly not in very formal writing). " refers to a past situation: If that thing had been done at some time in the past then it would have had the stated effect. " refers to a present or future situation.
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AnonymousDoes this sentence sound natural enough? Is it used by native speakers as well?Both of these are fine.
CalifJim
The difference is this: seem (alone) means to have the appearance (of something); make it seem means to give the appearance (of something).
Mr Wordy an implied action giving said appearance, even without "make it" ....... conversationally pretty much interchangeableYes. The first word of the statement -- "that" -- implies some action of mine. That already encapsulates the idea of my making (causing, giving) some appearance, so the make part can be omitted.
CalifJim
This doesn't work in the general case of course. For example, where "that" means "placing mirrors there", we can't take these two as equivalent:
That would make it seem like the room was large.
That would seem like the room was large.