Strong Verb and Week Verb

Weak Verb

Those weak verbs which add -d or -ed to form the past tense and past participle, and have no change of vowel, are so easily recognized as to need no special treatment. Some of them are already given as secondary forms of the strong verbs.
But the rest, which may be called irregular weak verbs, need some attention and explanation.

Irregular Weak Verb is divided into two classes:

(1) Those which retain the -d or -t in the past tense, with some change of form for the past tense and past participle.

(2) Those which end in -d or -t, and have lost the ending which formerly was added to this.

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=D

Strong Verb 

Common verbs like be, go, run and take, to name a few, that do not form the past tense by adding -ed to the stem. Instead, strong verbs change at least the vowel and sometimes the entire stem: was/were for be; went for go; ran for run; took for take; begin for start; build for make.

The key feature of a strong verb is (usually) that the simple past tense and the past participle do not end in -ed (or -t used in place of -ed). Often the stem vowel changes, too.

Examples of strong verbs (British English)

• sing - sang - sung
• break - broke - broken
• run - ran - run
• hit - hit - hit
• =)

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