since 与after 在用法上的区别

since....一般指一个时间段,是完成时的标志.e.g. she had stayed at the bed since she was sent to hospital
after ...一般指一个时间点,一般用过去时.e.g. he rushed out from the classroom after the bell rang

since she was little, she can xxxx

after she was born she xxx

since- indicate that it is from a past set of time

after is after a certain period

since 接完成时 she has been a worker since three years ago
after接过去时she got up after three o clock yesterday