After transitive verbs always use the objective cases of the pronouns.
For "_He_ and _they_ we have seen," say "_Him_ and _them_ we have seen."


THAT FOR SO

"The hurt it was that painful it made him cry," say "so painful."


THESE--THOSE

Don't say, _These kind; those sort_. _Kind_ and _sort_ are each singular
and require the singular pronouns _this_ and _that_. In connection with
these demonstrative adjective pronouns remember that _this_ and _these_
refer to what is near at hand, _that_ and _those_ to what is more
distant; as, _this book_ (near me), _that book_ (over there), _these_
boys (near), _those_ boys (at a distance).


THIS MUCH--THUS MUCH

"_This_ much is certain" should be "_Thus_ much or _so_ much is certain."


FLEE--FLY

These are two separate verbs and must not be interchanged. The principal
parts of _flee_ are _flee_, _fled_, _fled_; those of _fly_ are _fly_,
_flew_, _flown_. _To flee_ is generally used in the meaning of getting
out of danger. _To fly_ means to soar as a bird. To say of a man "He _has