prepositions and present participle time expressions
( since - after - before - while)
For example:
1-
(1) Since leaving[u][/u] (leave) school today, I had a nice surprise. (2) before going (go) home, and (3) while walking (walk) along the street, I met my cousin . I hadn't seen him for ages, so we had a long chat (4) after saying (say) goodbye to him, I continued on my way home. My dad was worried about me because I was late.
2-
My brother's getting married
on Saturday morning
My father graduated
in 1984
Khalid's coming to visit us
on October 13th
In the USA, schools are on holiday
in July and august