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Time subordinators:

When
While*
As
Before
By the Time
Until*
After
Once
Since*


In contrast to those of group two, each of the subs in the third group share the common time relationship of the action in the independent clause happening after the action in the dependent clause.

   In the example...

    After Tom ate at McBurgers, he got sick.

...the action in the dependent clause [Tom ate at McBurgers] happened first while the action in the independent clause [he got sick] happened second.

IC = second
DC = first

This relationship holds true for all the subordinators in group three. That said, like group two, there are some variations between the members of this group that are also worthwhile exploring.




After Vs. Once:

After and once have almost the same meaning, but differ in how quickly one action happens after the other. This can be seen in the examples below...

    After her husband Tom died, Jessica got married again.

...differs in meaning from...

    Once her husband Tom died, Jessica got married again.

Thus, in the first example, it's possible to conclude that it may have been quite some time after Tom's death that Jessica remarried while the second, implies that she wasn't even waiting around for the body to cool. Poor Tom.




Finally, the sub in the fourth group warrants its own group because of its use of the perfect tense in the independent clause which carries the meaning of an action that happened before a specific point of reference. [See The Verb Tense System for more on this.]

   In the example...

    Tom has liked Jessica since he first met her.

...the independent clause must be in a perfect tense/aspect.

Be sure to check out some common... [issues with time clauses]


Next up... Contrast subordinators.

 

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