This isn't, in my view, a complaint about grammar, the rules of which dictate how words are put together to form a sentence.

That's why it's important to know what form the sentence takes before you utter it.

Both a noun and a verb, without endings, can alone form a sentence.

Activities in each milestone include games, rhymes, drawing, and songs to teach a letter or a word, form a sentence, do maths and science, or understand a concept.

He breathes through a tube and speaks through an eye-gaze computer, staring at each letter on a screen until it forms a sentence (like predictive text).