他以前不常说英语，换了新工作之后天天都在用。
He didn't use to speak English often, but he uses it every day at his new job.
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didn't英 /ˈdɪdnt/|美 /ˈdɪdnt/
use英 /juːz/|美 /juz/|英 /juːs/|美 /jus/
to英 /tuː/|美 /tu/|英 /tə/|美 /tə/
解释
didn't use to 否定过去的行为频率，由 didn't + use + to + 动词原形构成，表示语言使用习惯的显著变化。
He didn't use to speak English often, but he uses it every day at his new job.
didn't use to 否定过去的行为频率，由 didn't + use + to + 动词原形构成，表示语言使用习惯的显著变化。