make certain

(把…)弄确实，弄清楚

make a guess at, make a journey, make a mess of, make a mockery of, make a note of, make a promise, make a success of sth., make a/the difference, make advances, make allowance for, make an appeal to sb, make appointments with, make as if, make at sb, make away, make away with, make away with oneself, make beds, make believe, make bricks without straw, make commitment to, make contact with, make do with, make down, make for, make for sb/sth, make friends, make friends again, make friends with, make friends with sb., make fun of, make hold to, make it a point to do, make it plain, make light of, make love to, make mention of, make much of, make no difficulties, make no question of,