mostly

Mostly means for the greater part — not all of it, but close. The audience was mostly children, the fridge is mostly empty, I mostly cycle to work.

It does two jobs. One is proportion: the crowd was mostly students tells you what the bulk of it was made of. The other is habit, so I mostly eat at home means most of the time rather than every time. It goes before the main verb but after am, is and are — she is mostly at home on Fridays. Do not swap it for most, which stands in front of a noun: most people agree, never mostly people agree. In Indian English it carries a third sense, probably, borrowed from local languages, as in he'll mostly come tomorrow.