到年底时，他就能流利地用英语表达自己的想法了。
By the end of the year, he was able to express himself fluently in English.
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was英 /wɒz/|美 /wɑz/
able英 /ˈeɪbəl/|美 /ˈeɪbəl/
to英 /tuː/|美 /tu/|英 /tə/|美 /tə/
解释
was able to 描述经过一段时间发展后达到的能力状态，by + 时间点强调到某个时刻已经具备该能力。
By the end of the year, he was able to express himself fluently in English.
was able to 描述经过一段时间发展后达到的能力状态，by + 时间点强调到某个时刻已经具备该能力。