English Grammar Essentials For Dummies – Australia

forms of to be: am, are, is, was, were, will be, shall be, has been, have been, had been, could be, should be, would be, might have been, could have been, should have been, shall have been, will have been, must have been, must be
sensory verbs: look, sound, taste, smell, feel
words that express shades of meaning in reference to a state of being: appear, grow, remain, seem, stay, turn.

These days, grammar is the study of language — specifically, how words are put together to create meaning. Through time, grammar has also come to mean a set of standards that you have to follow in order to speak and write correctly

Learning some grammar terms has a couple of important advantages — to be clear about why a particular word or phrase is correct or incorrect, and to be able to understand the explanations and advice given by your computer’s grammar checker or in a dictionary or style guide.

Rightly or wrongly, your audience or readers judge you by the words you use and the way you string them together.