0No. 01i 00 02i 02br 01i 00They01b 00 have been02b 00 friends since they 01b 00were 02b 00young/10 years old. 02i 00 [instantaneous event: use past tense and "when" 0-
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01cite10Vincent Teo12cite10Can I say, 12br
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10(a) They become friends since they are /were young. 11font10No.12font12br
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10(b) They became friends since they were 10 years old. 11font10No.12font12br
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