what does it mean by strong and weak sounds in verbs?

can i have some examples??
Some words, not only verbs, that are used a lot in speaking, have one weak sound and one strong sound.
Weak forms are used in 'connected speech', that is, when you are having a normal, everyday conversation or when they are in the middle of a sentence.
For example, the weak form of the verb 'have' is /hev/ or /ev/, e being the unstressed sound called 'swcha' (usually written as an inverted 'e'), which you can hardly hear. This form is mostly used when the verb 'have' is functioning as an auxiliary verb as in They have been doing the hovering or in sequences such as should have, could have, would have.

Strong forms are normally used when we say a word isolated from speech with an emphasis on the vowel. These forms are used by native speakers of English when talking to a foreigner, for example, or in questions.
The strong form of 'have' would be /haev/ (the ae symbol is the standard short 'a' sound).

Modal verbs usually have these two forms. But, negative forms of these verbs only have a strong pronunciation, for example aren't, can't or won't.
Words that also have strong and weak pronunciation are: he, his, she, her, is, are, some, a, an, the, of, for, and or to.

There are many more examples. In any pronunciation dictionary you can find the weak and strong forms of a particular word, if it has both forms, that is.

Hope it helps.
How about the existential "there"? It usually takes the weak form, I know. But what if it is used in the question form, in a quesion tag, for instance? It'd be nice to get someone to enlighten me on this. Thanks.
Teachers: We supply a list of EFL job vacancies
There aren't verbs with weak forms.
There're only words that are not "telegram words" (nouns, verbs, adjectives, etc.)

Ans the strong form only exist in words that have a weak form.

Ese es mi aporte, chao.
please i need more information about weak and strong forms.
Anonymous please i need more information about weak and strong forms.
Students: We have free audio pronunciation exercises.
What is the difference in pronunciation between I do it and I will do it