A.as though | B.for fear that |
C.on condition that | D.as far as |
A.as if | B.in case | C.even if | D.so long as |
A.on | B.since |
C.until | D.after |
A.unless | B.when | C.once | D.even if |
A.so during this time | B.during which | C.during which time | D.so when |
A.when | B.if | C.once | D.because |
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