There is one strange passage in Practical English Usage:
In the rather formal structure not only ... but also, the expressions not only and but also can go immediately before the words or expressions that they modify.
Not only the bathroom was flooded, but also the rest of the house.
Not only can be moved to the beginning of a clause for emphasis. It is then followed by auxiliary verb + subject; do is used if there is no other auxiliary (for more about this word order, 270). But can be left out in this case.
Not only has she been late three times; she has also done no work.
Well the contradiction is obvious. Can someone explain it?