Объяснение:
If I had not known him for so long, I would have doubted his sound mind, since he behaves completely inappropriately.
2. If residents of this area of the city protested more actively against the work of this chemical plant, they would have already achieved its closure.
3. Some students simply do not have the patience to learn this simple rule, so they still make a lot of mistakes in their written work.
4. Residents of this apartment building constantly complain about their neighbors who live in an apartment on the ground floor and never clean the staircase.
5. You (3 years, plural) should contact an experienced therapist, since you have had a fever for the third week already.
