Lady. Do not use lady to designate sex only. It is properly used to indicate persons of refinement.

Wrong: Is Mrs. Johnson a colored lady?
Right: Is Mrs. Johnson a colored woman?
Right: Mrs. Johnson is a colored woman, and a lady.

Latter. Do not use latter to refer to more than two objects. Use last. See §41.

Lay. Do not confuse lay and lie. See §57.

Learn. Do not confuse learn and teach. Learn means to acquire knowledge. Teach means to impart knowledge.

Wrong: He can learn you as much as any one can.
Right: He can teach you as much as any one can.

Leave. Do not confuse leave and let. Leave means to let remain. Let means to give permission.

Wrong: Will your mother leave you go?
Right: Will your mother let you go?
Right: I shall leave my trunk in my room.

Liable. Do not use liable for likely.

Wrong: It is liable to rain to-day.
Right: It is likely to rain to-day.
Right: He is liable for all that he has agreed to pay.