IS vs ARE
Consider the following examples:
1. Drinking and driving IS illegal
2. Drinking and driving ARE illegal
3. Stealing and murdering IS illegal
4. Stealing and murdering ARE illegal
According to me, #1 and #4 are correct. The "rule" that I apply is that if the two preceding verbs are combined into a single activity, then the singular form of the joining verb (IS) should be used. If the two preceding verbs are independent actions, then the plural form of the joining verb (ARE) should be used. No one in my office agrees with me, and I cannot find an authoritative guide anywhere online.
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