A Practical and Authoritative Guide to Contemporary English. 1996.
Page 144
don’t be surprised if someone objects, for many people believe this is an error for wreaked havoc.
1
yet
In formal writing, yet in the sense “up to now” is normally used with an accompanying verb in the present perfect rather than in the simple past. Thus you should say He hasn’t started yet, not He didn’t start yet. The use of yet with the simple past is common in speech and may be appropriate for informal writing.
