Common English grammar mistakes and their solution

Appraise
Appraise means to make an estimate: “Will you appraise the value of this ring?”
Apprise
Apprise means inform (usually in a formal sense): “He was apprised by registered mail that his lease would not be renewed.”
Claim
Claim refers to a justified demand or legal right: “I claim this piece of property.”   “I claim the prize.”
Assert
Assert should not be used when only an assertion is intended: “He asserted (not claimed) that his demands were reasonable.”
Consul
A consul is government agent who lives in a foreign country to protect the interests of the citizens of his own country: “When I lost my passport, I went immediately to the consul,”
Council
Council is a group of individuals who act in an advisory capacity or who meet for the purposes of discussion-making: “The mayor met with the council.”  “They called a council to make plans for the future.”
Counsel
Counsel as a noun means advice, or in legal parlance, a lawyer or lawyers: “He sought my counsel.”  “He retained counsel to represent him at the trial.”
Councilor
A councilor is a member of a council.
Counselor
A counselor is an adviser.
Credible
Credible means believable: “His story was entirely credible.”
Creditable
Creditable means meritorious, praiseworthy—but not outstanding: “His performance was creditable, but I wouldn’t pay admission to hear him again.”
Credulous
Credulous means ready to believe: “Being a credulous person, he believed everything he read.”