Do they usually play tennis on Mondays?
Объяснение:
Так как это время Present Simple, на что нам указывает наречие usually - обычно, то с местоимением they мы используем do.
1) Sandy reads historic books every day.
2) What is Liza doing now? — Liza is writing a letter.
3) Kate met with her friends 10 minutes ago.
4) When will Jill come to the office tomorrow?
5) Simon bought a ticket yesterday.
6) Mary read the text while Ann was translating the words.
7) Charlotte did her homework while her friend Megan was reading the text.
8) The Ivanovs went to the Hermitage last week.
9) The sun has not risen yet, but the sky is getting lighter every minute.
10) Sandy did not go to the shopping mall yesterday.
Do they usually play tennis on Mondays?