| catch on(verb, expression, check, determine) |
| check out(verb, expression, determine, discover) |
| check up on(expression, idiom, check, determine) |
| dig(verb, check, determine, discover) |
| discover(verb, check, determine, confirm) |
| double-check(verb, check, determine, discover) |
| establish(verb, determine, discover, confirm) |
| eye(verb, check, determine, discover) |
| eyeball(verb, check, determine, discover) |
| find out(verb, expression, check, determine) |
| get down cold(expression, idiom, check, determine) |
| get down pat(expression, idiom, check, determine) |
| get hold of(expression, idiom, check, determine) |
| get the hang of(expression, idiom, check, determine) |
| identify(verb, check, determine, discover) |
| learn(verb, check, determine, discover) |
| learn the ropes(expression, idiom, check, determine) |
| look-see(verb, check, determine, discover) |
| make certain(verb, expression, check, determine) |
| make sure(verb, expression, check, determine) |