Cadence
In plainchant, a sentence of text almost always ends with "a cadence" (why did you choose music appreciation, that was my biggest mistake)
No. The correct sentence is: He always helps you. "He" almost always takes a verb that ends with "s" in the present tense. The only exception I can think of to this rule is "can", i.e. He can always help you.
tonic chord
An imperative sentence ends with a period and begins with a verb. It always always gives a command.
The end of a sentence always needs a period.
Lack of training almost always ends with poor results.
You've almost answered your own question. It shows that the sentence it ends, is indeed a question.
your question ends with who. and so did my first sentence
A comma does not belong before a parenthesis ( which is always part of the preceding idea).
Yes. A sentence that ends with a question mark is called an interrogative sentence.
It ends with a Period??
The past of a regular verb always ends in -ed.