But what. Should be but that.
Calculate. Do not use for intend.
Can. Do not use for may. “May I go with you?” not “Can I go with you?”
Clever. Does not mean good-natured, but talented.
Demean. Means to behave, not to debase or degrade.
Disremember. Now obsolete.
Don't. Not to be used for doesn't, after a singular subject such as he.
Else. Not follow by but; say, “nothing else than pride.”
Expect. Do not use for think, as in “I expect it is so.”
Fetch. Means to go and bring, hence go and fetch is wrong.