"It would not have fitted" is the correct grammar.
The correct phrase is "It would not have fit." This is the proper use of the past perfect tense with the verb "fit."
Yes. But not in the sentence "the key fitted into the lock". An example: the woman was fitted for her fancy dress so it would be the right size.
The jacket was very loosely fitted.
the thinnest man fitted into the chimney
The past tense of "fit" is "fitted" or "fit." Both are commonly used and considered correct.
It has a fully fitted kitchen and separate scullery area.
About 30-32 psi if recommended tires are fitted.
Get yourself fitted.
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I once had a caravan fitted with an instantaneous water heater.
the correct pressure should be on a plate inside the driver side door panel or in the vehicle owner manual, tire pressure is vehicle specific
A FLUE is a chimney or vent. IE A flue was fitted to my central heating unit.