🏃 動詞の形 ・ アオイ
TOEIC Part5文法問題 アオイ: Q53（動詞の形）
Please ___ us know if you require any additional documentation.
Please ___ us know if you require any additional documentation.
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正解: A) let
This is an imperative sentence beginning with 'Please', so the verb must be the base form: 'let'. 'Let us know' is a set expression meaning 'please inform us'. 'Lets' is third-person singular, 'letting' is a present participle, and 'to let' is an infinitive — none can be the verb of an imperative sentence.