Strong verbs can be identified by how they change when they go to the past tense. Some verbs will simply add -ed -d or -t to the end. These are called weak verbs. Strong verbs often change a vowel instead of adding an ending. here are some strong verbs; Give, and stuck. These in the past tense are Gave and Stuck. Maybe to illustrate this, show the transformation of the word to its past tense.

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Here's a few strong verbs that I like...

- Aggravate
- Analyze
- Burden
- Categorize
- Contrast
- Control
- Define
- Demonstrate
- Envision
- Explode
- Focus
- Generate
- Highlight
- Illustrate
- Justify
- Launch
- Maximize 
- Nullify
- Outline
- Prelude
- React
- Show
- Strengthen
- Transform
- Threaten
- Underpin
- Vitiate
- Weaken.

(I have a list of these verbs saved that I like. :)) 

I don't know if you mean by illustrate make a sentence... but here's a couple of examples.

Example 1: "I didn't know how to react..." I stammered, looking up at her.
Example 2: He demonstrated a very fine control of his fiery temper.
Example 3: I knew she was only doing it to aggravate me.