Based on the given sentence "when we got up it (rain)", we need to supply the correct form of the verb.
To determine the correct form of the verb, we need to identify the subject of the sentence. In this case, the subject is "it".
Next, we need to determine the correct form of the verb "rain". Since the subject "it" is singular and in the present tense, we should use the third person singular form of the verb "rain", which is "rains".
Therefore, the correct form of the verb in the sentence is "rains".
