ڕێڕەوی زانیاری · کەرتی ٣-١

Expressing certainty and possibility

*must be* and *can't be* for certainty against *may be*, *might be* and *could be* for possibility; the past forms with *have been*; and the difference between using them with *be* and with a main verb (`~ing` for the present, `~ed` for the past). Covers the in-lesson box and the Language Focus explanation.