в present simple.
1/ You visit parents.
2/ - You do not visit parents.
3/общий вопрос? Do you visit parents?
4/ кто Who visits parents?
5/кого посищял Who do you visit?
present continous.
1/ . You are visiting parents.
2/ - You are not visiting parents.
3/общий вопрос? Are you visiting parents?
4/ кто Who is visiting parents?
5/кого посищял Who are you visiting?
present perfect.
1/ . You have visited parents.
2/ - You have not visited parents.
3/общий вопрос? Have you visited parents?
4/ кто Who has visited parents?
5/кого посищял Who have you visited?
Поделитесь своими знаниями, ответьте на вопрос:
Смодальными глаголами 1. high intensity of human activities be the cause of water pollution a) is able b) may c) ought d) should 2. lanfills are needed for waste that be recycled or safely burned a) can't b) needn't c) mustn't d) should not 3. efforts to decrease air pollution be made at the national as well as at international levels a)are able b) have c) must d) ought 4. manufacturers make products that have fewer toxic components a) are able b) need c) ought d) should 5. an effective sewage discharge technology be used to control water quality a) should b) need c) is able d) has 6. any large engineering projects harm the earth or the life on it a) can't b) might not c) mustn't d) needn't