from then on after that since then from now on希望有易懂点的.最好有一般和什么时态连用,放句子什么部位.

from then on 过去时和完成时
after that 用完成时 过去时
since then 用完成时 过去时
from now on 用将来时

from then on用完成时
after that 用完成时 过去时
since then 和上面一样
from now on 用将来时
这些都是放句子句首或者句尾,.