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1.I got to the station five minutes late,and it wasn't until then did I find that I had left my wallet home.

2.I got to the station five minutes late,and it wasn't until then that did I find that I had left my wallet home.

3.I got to the station five minutes late,and it wasn't until then I did find that I had left my wallet home.

4.I got to the station five minutes late,and it wasn't until then that i did findthat I had left my wallet home.

Thanks advance !
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...it wasn't until then that I found that...

... and only then did I find that...
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Thanks for yorur quick reply Emotion: smile
The second two are grammatical,whereas the first two are not.

In the first sentence,the connective that is left out,which is immediately before did .The connective pronoun that adds up to that a statement in a normal form rather than an inversion should be followed,and it is in this case that the first example sentence is ungrammatical,and so it is with the second one.

Hope you will be satisfied with my explanation.
AnonymousThe second two are grammatical,whereas the first two are not.
In the first sentence,the connective that is left out,which is immediately before did .The connective pronoun that adds up to that a statement in a normal form rather than an inversion should be followed,and it is in this case that the first example sentence is ungrammatical,and so it is with the second one.
Hope you will be satisfied with my explanation.
The second two are not grammatical either. Please see the post that answered this question two years ago.
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