Learn French: Parfois, je suis fatigué et je n'ai pas d'énergie. - Sometimes, I am tired and I have no energy.

Yes! While parfois (sometimes) is placed at the beginning of this sentence to set the scene, adverbs of frequency usually go right after the conjugated verb. You could also say Je suis parfois fatigué, which is perfectly correct.

If a woman is speaking, does the word fatigué change?

Yes! French adjectives change to match the person they describe. If a woman is speaking, she needs to add an extra e to make it feminine: fatiguée. The good news is that fatigué and fatiguée sound exactly the same.

Why is it pas d'énergie instead of pas de l'énergie or pas une énergie?

This is a very important rule in negative sentences! When you say you don't have something using ne ... pas, words like un, une, or des (a, an, some) change to simply de (or d' before a vowel). Because énergie starts with a vowel, it becomes pas d'énergie.

Why do we write n'ai instead of ne ai?