to examine (a thing) carefully in order to learn something about it

examine and determine

to think about (a person, thing)

turn over in one's mind

to look at at, think about, (oneself, ideas etc)

think about seriously; plan

to look at (a person, thing) carefully in order to learn something; to put questions to (a person) in order to test knowledge or get information

analyse, test

to produce (an idea etc) as a hypothesis

speculate

to think deeply or dreamily, ignoring what is happening around one

think about, dream

a plan, idea etc that cannot happen or be successful

think about deeply and theorize

to thing seriously; (of some animals) to swallow food then return it to the mouth later and chew it

think about seriously

to think, consider, form opinions (without having complete knowledge); to buy and sell goods, shares etc with the hope of profit from changes in their market value

think about deeply and theorize