Esther: 1. Leonardo da Vinci : Makes a lot of inventions.

Correct: 1. Leonardo da Vinci :?Made a lot of inventions.

Esther: 2. Rudolf Diesel: Rudolf Diesel created a car engine.

Correct: 2. Rudolf Diesel: Rudolf Diesel created?the car engine.

Esther: 3. Marconi: inventor of the radio telegraph system.

Correct: 3. Marconi: Is the inventor of the radio telegraph system.

Esther, always be aware of the usage of articles as well as the verb tenses for your sentences to be easily understood by your readers/listeners. However, I'm glad that you're improving when it comes to sentences construction. I'm proud of you. Keep up the good work!

Teacher Lyn^^