• 1. Will you see the doctor next week?
• 1. They will plant trees along this street next month.
• 1. He will write to his friend next week.

Present Continuous (because the action is happening around the time of speaking):

• 1. He is often picking his friend up at the train station in the morning. (This sentence sounds a bit unnatural. It might be better to rephrase it as "He often picks his friend up at the train station in the morning.")
• 1. He is watching a romantic film on TV this evening.
• 1. I am reading an interesting novel at the moment.
• 1. They are playing soccer at the moment.
• 1. Thanh and Hung are reading a wonderful story at the moment.
• 1. I often wash my clothes. (Habitual action)
• 1. We meet each other twice a month. (Habitual action)
• 1. He is drinking beer at the bar at the moment.
• 1. They usually sing in the early morning. (Habitual action)
• 1. They plant trees in the early year. (Habitual action in the past) OR They are planting trees early this year. (Present continuous if they are planting trees right now at the beginning of the year)
• 1. He is not studying Math at the moment.
• 1. Does she play badminton every afternoon? (Present simple for a habitual action, question form)
• 1. They sometimes do morning exercises at 5.30. (Habitual action with "sometimes")
• 1. Thanh and I are at home now.
• 1. Hung runs about 5 km every morning. (Habitual action)
• 1. Do Hung and Minh sometimes meet each other? (Present simple for a habitual action, question form)
• 1. Every evening, she jogs about 3 km. (Habitual action)

Present Simple (for habits and general truths):

• 1. They are not doctors. (State of being)
• 1. Do you often do your homework in the evening? (Habitual action, question form)
• 1. Do you usually watch TV in the evening? (Habitual action, question form)
• 1. They always talk to each other on the weekend. (Habitual action)
• 1. She often doesn't go shopping on weekends. (Habitual action with "often")
• 1. They are not classmates. (State of being)
• 1. Is he your father? (Question about state of being)
• 1. Is she listening to music now? (Action happening now, question form)
• 1. Mai and Hang aren't playing the game at the moment. (Negative present continuous)
• 1. She isn't at home now. (Negative present continuous)
• 1. Do you often write to your friend? (Habitual action, question form)
• 1. Mr. Mai waters the plants every morning. (Habitual action)
• 1. He is listening to the telephone at the moment. (Present continuous)
• 1. They always don't go to school by train. (Awkward construction. Better to say: They always go to school by bus. OR They never go to school by train.)