Grammar.the past continuous tense. 1.this time last monday (to sit) on a beach. 2.when you saw me last, (to wear) a new dress. 3. (to speak) for two hours. (to wait) for you more than an hour. 5. (to work) when we were back. и объясните почему так пишем?

1.This time last Monday I sitting on a beach.
2.When you saw me last,l wearing a new dress.
3.She speaking for two hours.
4They waiting for you more than an hour.
5.He working when we were back.
Но я не уверена,что это правильно