tiene por masa atómica a = 48.8 y por número atómico Z = 20 Cuántos electrones y protones tiene
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1. Which is a signal word for simple present?
a. now b. last Monday c. often
2. Which is a signal word for simple present?
a. sometimes b. at the moment c. yesterday
3. Which is a signal word for simple present?
a. last Friday b. every Friday c. next Friday
4. Which is not a signal word for simple present?
a. never b. already c. usually
5. Which is not a signal word for simple present?
a. Listen! b. first ... then … c. seldom
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Which is a signal word for simple present
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