... object,inseparable): stop being behind: wyrównywać, doganiaćinnych. "Terry stopped to rest for a few minutes. He'll catch up /catch up with us later."check in (to) (inseparable): ... less thin; gain weight:zaokrąglać się, wypełniać "Jerry used to be really skinny, but in the last year he'sbegun to fill out."find out (about) (inseparable): learn / get information(about): ... tobegin!"look into (inseparable): investigate / get more details aboutsomething: sprawdzić, zbadać. "Someone said there was a meeting at 9:30 but I haven'theard anything about...