Hello, todattn—and welcome to English Forums. Thank you for registering as a member. todattn I do not know why they used "be" here, There are certain expressions that still (or at least in Dale Carnegie's time) take the subjunctive form of the verb.
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todattnI do not know why they used "be" here,There are certain expressions that still (or at least in Dale Carnegie's time) take the subjunctive form of the verb. 'It is important that...' is one of these expressions. Some others are:
todattn dearPlease learn now that 'dear' is used only to lovers, family members, and children!