it is ... that it is ... since

- (, , ), it is (was) that (who, whom).
, I met his sisters in the park yesterday. , I, . . , , - , , I it was that (who):
It was I that (who) met his sisters in the park yesterday.
() .

his sisters, . . , , - , his sisters it was that (whom):
It was his sisters that (whom) I met in the park yesterday.
() .

in the park, . . , , , in the park it was that:
It was in the park that I met his sisters yesterday.
() .

yesterday, . . , , - , yesterday it was that:
It was yesterday that I met his sisters in the park.
() .
, , . .

master@onlinenglish.ru