EAT—ATE
Don't confound the two. Eat is present, ate is past. "I eat the bread" means that I am continuing the eating; "I ate the bread" means that the act of eating is past. Eaten is the perfect participle, but often eat is used instead, and as it has the same pronunciation (et) of ate, care should be taken to distinguish the past tense, I ate from the perfect I have eaten (eat).
SEQUENCE OF PERSON
Remember that the first person takes precedence of the second and the second takes precedence of the third. When Cardinal Wolsey said Ego et Rex (I and the King), he showed he was a good grammarian, but a bad courtier.
AM COME—HAVE COME
"I am come" points to my being here, while "I have come" intimates that I have just arrived. When the subject is not a person, the verb to be should be used in preference to the verb to have; as, "The box is come" instead of "The box has come."
PAST TENSE—PAST PARTICIPLE
The interchange of these two parts of the irregular or so-called strong verbs is, perhaps, the breach oftenest committed by careless speakers and writers. To avoid mistakes it is requisite to know the principal parts of these verbs, and this knowledge is very easy of acquirement, as there are not more than a couple of hundred of such verbs, and of this number but a small part is in daily use. Here are some of the most common blunders: "I seen" for "I saw;" "I done it" for "I did it;" "I drunk" for "I drank;" "I begun" for "I began;" "I rung" for "I rang;" "I run" for "I ran;" "I sung" for "I sang;" "I have chose" for "I have chosen;" "I have drove" for "I have driven;" "I have wore" for "I have worn;" "I have trod" for "I have trodden;" "I have shook" for "I have shaken;" "I have fell" for "I have fallen;" "I have drank" for "I have drunk;" "I have began" for "I have begun;" "I have rang" for "I have rung;" "I have rose" for "I have risen;" "I have spoke" for "I have spoken;" "I have broke" for "I have broken." "It has froze" for "It has frozen." "It has blowed" for "It has blown." "It has flowed" (of a bird) for "It has flown."
N. B.—The past tense and past participle of To Hang is hanged or hung. When you are talking about a man meeting death on the gallows, say "He was hanged"; when you are talking about the carcass of an animal say, "It was hung," as "The beef was hung dry." Also say your coat "was hung on a hook."