_Two_ prepositions should not govern _one objective_ unless there is an
immediate connection between them. "He was refused admission to and
forcibly ejected from the school" should be "He was refused admission to
the school and forcibly ejected from it."


SUMMON--SUMMONS

Don't say "I shall summons him," but "I shall summon him." _Summon_ is a
verb, _summons_, a noun.

It is correct to say "I shall get a _summons_ for him," not a _summon_.


UNDENIABLE--UNEXCEPTIONABLE

"My brother has an undeniable character" is wrong if I wish to convey the
idea that he has a good character. The expression should be in that case
"My brother has an unexceptionable character." An _undeniable_ character
is a character that cannot be denied, whether bad or good. An
unexceptionable character is one to which no one can take exception.


THE PRONOUNS

Very many mistakes occur in the use of the pronouns. "Let you and I go"
should be "Let you and _me_ go." "Let them and we go" should be "Let them
and us go." The verb let is transitive and therefore takes the objective
case.