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Originally Posted by Lang Kamara The correct one is 'understanding' because the word 'to' following 'critical' is a preposition and should be followed by a gerund, the 'ing' form of a verb. |
A preposition is followed by a gerund. This is true. However, "to understand" is an infinitive. In this case "to" is part of an infinitive. I would, therefore, not apply this rule in this particular example.
