'A BIT' can also be used to mean "a small amount," but it's often used in informal speech and can sometimes convey a slightly more casual or colloquial tone.
'A LITTLE' and 'A LITTLE BIT' are more interchangeable and can both be used to refer to a small amount of sth. The difference between them is quite subtle and often depends on the context and the speaker's preference.
'A BIT' ‑ "I'm 'A BIT' tired" is similar to saying "I'm ' A LITTLE' tired."
'A LITTLE' ‑ "I need 'A LITTLE' more time."
'A LITTLE BIT' ‑ "I need 'A LITTLE BIT' more time."
Overall, the differences are nuanced and the phrases can often be used interchangeably in many contexts.
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English Grammar Tips (I)
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