Докажите, что в треугольнике АВС, где А (2; 1; 3), В (1; 1; 4) и С (0; 1; 3), угол В прямой.

раскройте скобки,употребляя глаглы из следущих времен: present simple, past simple,future simple, present continuous,past continuous,present perfect, past perfect

1.Autumn (to come). it (to be) November now. it colder , the days (to get) shorter. it often (to rain). soon it (to be) very cold. 2.When i (to do ) my homework yesterday, i quickly (to run) to the yard, because my friends (to waiy) for me there. 3. We (to have) a nice time last summer. 4.What you (to learn)for today? i (to be) sorry, i (not to do) anything.