difficult / hard, probably impossible

be accurate to say, indeed be so / sayable, to be able to say

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

nothing special; not really

not particularly

(chiefly in the negative) so much; so often; so long; particularly; especially

Used when something comes to mind: to recall / Used to express agreement: yeah, of course

(informal) no problem

unthinkable, out of the question

practical question (problem)