Question

He acted as he____the principal.(was,were)

Answer 1

He acted as he was the principal

Explanation:

• It is important to know when to make use of "was" and when to make use of "were".
• Was is used in the first person form. When the talk is about a singular (I)
• It is also used when third person singular form is used, meaning (he, she, it)

• Were is used in context of second person form. This may be second person singular or plural. For instance, (you, your, yours)
• It is also used in first and third person plural (we, they).

In another case,  

-He acted as though he were the principal.

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Answer 2

Correct verb:

He acted as he was the principal.

Explanation:

• Was and were are past form of the verb "be."
• Was defines the singular form whereas were defines the plural form.
• Was is used in the third person singular (he, she, it) and first person singular (I).
• Were is used in first and third person plural (we, they) and first and third person plural (we, they).
• One should use a correct form of verb to form a correct sentence.