I was really anxious about you.I am terribly sorry.I( )home without a wordmust not leave shoulde not have left could have left need have left 原因!

I was really anxious about you.I am terribly sorry.I( )home without a wordmust not leave shoulde not have left could have left need have left 原因!
I was really anxious about you.I am terribly sorry.I( )home without a word
must not leave shoulde not have left could have left need have left 原因!

I was really anxious about you.I am terribly sorry.I( )home without a wordmust not leave shoulde not have left could have left need have left 原因!
shoulde not have left 不应该离开（家） 但是他离开了.因此,这是虚拟语气.