Сгруппируйте слова по их временным формам:
Simple Active, Simple Passive, Progressive Active, Perfect Active, Perfect Passive.

he uses-he is using - he used -he has used;
he could call-he can be called;
they named-they were named- they have been named;
he measures- he has measured.

Выберите правильный вариант отрицания и вспомогательного глагола для вопроса.

1. They … a new reagent in their experiment.
a) does not use he, she, it
b) did not use
c) is not used
2. We … this metal with sulphuric acid to obtain hydrogen yesterday.
a) did not treat
b) do not treat
c) does not treat
3. The researchers … new substances last week.
a) did not obtain
b) does not obtain
c) were not obtained
4. Soon we shall receive a new laboratory equipment…?
a) shall not we
b) didn’t we
c) don’t we
5. The experiment was very difficult…?
a) won’t it
b) wasn’t it
c) isn’t it
6. … a concentrated solution contain a large amount of a dissolved substance?
a) are
b) is
c) do
d) does