Never use I in referring to yourself except in a signed article.
Avoid the use of he or she and his or her. The use of either phrase is seldom required for clearness' sake. When a noun is used which may refer indifferently to both sexes, the accepted practice is to use the masculine pronoun. For example, say: Let the teacher do his duty and he need not fear criticism, not Let the teacher do his or her duty and he or she need not fear criticism.
Similarly after indefinite singulars like each, every, somebody, anybody, use the masculine singular pronoun. Thus, Everyone should do his duty and he should do it every day. Here one is not only to avoid the use of he or she and his or her, but also particularly and constantly to be on guard against they and their. Sentences like Nobody knows what they can do till they try; Everyone is urged to come and bring their pocketbooks with them, are frequently heard and often get into print.
Do not use the same for a third personal or a demonstrative pronoun. The farmer brought a load of wheat to town and sold it (not the same) at the mill.
Do not make such a pronoun, except in the phrase such as. He has fruits of all sorts and his prices for such are unreasonable, is the sort of use to be avoided.
Distinguish between its, possessive pronoun, and it's, contraction of it is.
Use either or neither only of two, any one or none of more than two, as: In one group are Russia, Germany and Austria, in another France and England. Any one of the first group acting with either of the second could determine the question. (As conjunctions, either and neither may introduce the first of a series of particulars consisting of three or more. It is correct to say Neither this nor that nor the other thing; but when used as pronouns, either and neither should be rigidly confined to use with reference to two only.)
Prefer always no one and nobody to not any one or not anybody, as It is no one's (or nobody's) business, not, It is not any one's (or not anybody's) business.
Do not use apiece for each of persons. Say: The men each took an apple or took an apple each, not The men took an apple apiece. But they might have bought the apples at so much apiece.
Be careful not to say these sort of things, these kind of men, for this sort of things or this kind of men.