1. Why are these words plaсed here together: a) careful, beneficial, physical, spiritual, industrial, essential, agricultural; b) technology, technique, technological, technologist, technical, technician; c) undesirable, unknown, uncommon, unusual. What parts of speech may they be? Use them in the examples of your own
Остальные ,соответственно,- Present Perfect
I have built a house.
I have built a house when he came out of school
I have never built houses
I haven't built a house
Have you ever built a tower?
We built a house today
I have not yet learned words
We haven't made tutorials
They have never seen a crocodile
They haven't seen yesterday the crocodile
Так. На заметку.
Время Present Perfect обозначает действие, которое завершилось к настоящему моменту или завершено в период настоящего времени
Время Past Simple(indefinite) используется для обозначения действия, которое произошло в определенное время в и время совершения которого уже истекло