Page 423 - Basic Japanese
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8.11. Conditionals (uses)
In the meaning ‘supposing something happens (now or in
the future), supposing something is so,’ the conditional is
very similar to the provisional with its meaning ‘provided
something happens, provided something is so.’ For the
meaning ‘if,’ there are three possibilities: conditional
‘supposing that,’ provisional ‘provided that,’ and PLAIN
IMPERFECT + PARTICLE to ‘if = whenever.’

