Задание

Explain the difference in grammatical meanings between sentences A and B

A) Mary does her homework in the evening.

B) Mary is doing her homework now.

A) On Saturdays the whole family comes to my grandmother's house.

B) On Saturday we are going to my grandmother's house.

A) Mark has many interesting hobbies.

B) He is having sandwiches for breakfast.

A) The train leaves at 10:30.

B) The train is leaving now.

A) Snow melts in spring.

B) You're always making so much noise!