park sang joon then after they have facilitated their crossing This one fits the sentence better. Like 'suggests', 'use', 'invite', and 'collapse', 'have' is in the present tense, forming the present perfect (compound) tense. CJ
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park sang joonthen after they have facilitated their crossingThis one fits the sentence better. Like 'suggests', 'use', 'invite', and 'collapse', 'have' is in the present tense, forming the present perfect (compound) tense.
park sang joonso can I use ... the past tense in such casesYou can, but I don't recommend it. The tenses fall into two categories — those that have a present "point of view" and those that have a past "point of view":