|a) When I went to Regina, I visited my aunt.
b) I visited my aunt when I went to Regina.
|when I went to Regina = a time clause*
I visited my aunt = a main clause*
(a) and (b) have the same meaning.
|A time clause can:
1. come in front of a main clause, as in (a);
2. follow a main clause, as in (b).
|c) After Francois ate dinner, he went to the movies.
d) Francois went to the movies after he ate dinner.
e) Before I went to bed, I finished my homework.
f) I finished my homework before I went to bed.
g) While I was having a shower, the phone rang.
h) The phone rang while I was having a shower.
i) When the phone rang, I was having a shower.
j) I was having a shower when the phone rang.
|When, after, before, and while introduce time clauses.
when/after/before/while + subject and verb = a time clause
|Punctuation: Put a comma at the end of a time clause when the
time clause comes first in a sentence (comes in front of the main
time clause + comma + main clause
main clause + NO comma + time clause
|l) When the phone rang, I answered it.
||In a sentence with a time clause introduced by when,
both the time clause verb and the main verb can be simple past.
case, the action in the “when clause” happened
first. In (i): First: the phone rang. Then: I answered it.