main clause + time word + clausePut the main clause first when you want the result or main action first. No comma before the time clause in the neutral pattern.
Time Clauses
A2Use when, while, after, before, until, and as soon as to connect two actions in time. Put the time clause first or second; use a comma after it when it comes first.
What you'll learn
- Choose the right time word for the meaning.
- Use when and while for different kinds of actions.
- Put the time clause first or second with correct punctuation.
- Use present form in the time clause for future meaning.
- Recognize time-clause markers in sentences.
Structure
time word + clause, + main clauseWhen the time clause comes first, add a comma before the main clause.
When/Before/After/Until/As soon as + present clause, + will + main verbFor future meaning, keep the time clause in a present form. Put will in the main clause, not inside the time clause.
Build a sentence
Time word
Clause order
When Tom arrived,Anna smiled
When Tom arrived, Anna smiled.
Use when for one event linked to another event.
When to use
Sequence
Show which action happens first and which happens next. After Tom locked the door, he left the office.
Background action
Show one action in progress around another event. While Anna was driving, her phone rang.
Future plans
Talk about what will happen before, after, or when another future event happens. When Lisa arrives, we’ll start dinner.
Markers
whenwhileafterbeforeuntilas soon as
In contrast
vs if-vs-when-future
Both can talk about the future, but when gives time and if gives condition. When she arrives = she will arrive; If she arrives = maybe she will arrive.
vs relative-when-where
Time clauses connect two actions: Call me when you arrive. Relative when describes a noun: I remember the day when we met.
Common mistakes
Wrong
While Tom arrived, Anna was cooking.
Correct
When Tom arrived, Anna was cooking.
Arrived is one completed event, so use when, not while.
Wrong
Until I finished dinner, I washed the dishes.
Correct
After I finished dinner, I washed the dishes.
Until shows the limit before something changes. Here the second action happened later, so use after.
Wrong
When Maria will arrive, we will eat.
Correct
When Maria arrives, we will eat.
After a time word, use a present form for future meaning. Keep will in the main clause.
Wrong
When Tom arrived Anna smiled.
Correct
When Tom arrived, Anna smiled.
A time clause at the start is followed by a comma.
Wrong
As soon as Tom will finish, he will call you.
Correct
As soon as Tom finishes, he will call you.
As soon as follows the same pattern: present form in the time clause, future in the main clause.
Common misconceptions
❝ If both actions are in the future, both clauses need will. ❞
After time words like when, before, and as soon as, English uses a present form in the time clause: When she arrives, we’ll start.
❝ While is just a longer version of when, so they are always interchangeable. ❞
Use when for a single event and while for an action in progress around another action. They do not always mean the same thing.
Skills in this rule (6)
CONNECT_TIME_EVENTSw5Link two actions with a time word
Use when, while, after, before, until, or as soon as to show how two actions are connected in time.
PICK_WHEN_OR_WHILEw5Choose when for one event and while for an action in progress
Use when with a single event and while with a longer action happening around another action.
PICK_AFTER_BEFORE_UNTIL_AS_SOON_ASw5Choose the right time word for sequence or limit
Use after for later, before for earlier, until for the stopping point, and as soon as for the next immediate action.
PUT_TIME_CLAUSE_FIRST_OR_SECONDw4Place the time clause before or after the main clause
You can start with the time clause or put it second. If it comes first, use a comma after it.
USE_PRESENT_AFTER_TIME_WORD_FOR_FUTUREw5Use present form after a time word to talk about the future
After when, before, after, until, and as soon as, use a present form in the time clause even if the main clause is future.
RECOGNIZE_TIME_MARKERSw3Recognize common time-clause words
Spot words that introduce time clauses and use them to predict the relationship between the two parts of the sentence.