用since和for填空i’ve been here------two years i’ve been here------ yesterday i’ve been here-------i was a child i’ve been here-------two years agohe’s been in class --------4 o’clockhe’s been in class --------an hour agohe’s been in class --------4 hoursthey’ve lived in new york-------she left herethey’ve lived in new york-------1999they’ve lived in new york-------last month

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i’ve been here for two years i’ve been her since yesterday i’ve been here since i was a child
i’ve been here-since two years ago

he’s been in class -since 4 o’clock
he’s been in class since-an hour ago
he’s been in class -for-------4 hours
they’ve lived in new york--since-----she left here
they’ve lived in new york---since----1999
they’ve lived in new york---since----last month

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总的说来， since是从……以来，是一个时间点开始
for表示一段时间
希望对你有帮助哦~

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祝学习进步！如有帮助 请尽快采纳 O(∩_∩)O谢谢！

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亲爱的能总结出规律了吧

i’ve been here------two years for i’ve been here------ yesterday since i’ve been here-------i was a child since
i’ve been here-------two years ago since

he’s been in class --------4 o’clock since
he’s been in class --------an hour ago since
he’s been in class --------4 hours for

they’ve lived in new york-------she left here since
they’ve lived in new york-------1999 since
they’ve lived in new york-------last month since

授之以鱼不如授之以渔,告诉你答案是没用的
你要知道一个知识点
since+ 时间点
for+ 时间段

for since since since
since since for
since since since 解释：since是从过去的某个时间点开始，而for后是一段时间