English grammar is a basic skill that every English learner should learn carefully. In this section, each grammar topic provides you questions and answers. Basic grammar tests contain explanations of correct answers. The explanations help you to refresh your knowledge about your tested topic. Don't forget to read direction of each test before you start.

clause	group of words containing a subject and its verb eg: "It was late when he arrived"
comparative, comparative adjective	form of an adjective or adverb made with "-er" or "more" that is used to show differences or similarities between two things (not three or more things) eg: colder, more quickly
complement	part of a sentence that completes or adds meaning to the predicate eg: Mary did not say where she was going.
compound noun	noun that is made up of more than one word; can be one word, or hyphenated, or separated by a space eg: toothbrush, mother-in-law, Christmas Day
compound sentence	sentence with at least two independent clauses; usually joined by a conjunction eg: "You can have something healthy but you can't have more junk food."
concord	another term for agreement
conditional	structure in English where one action depends on another ("if-then" or "then-if" structure); most common are 1st, 2nd, and 3rd conditionals eg: "If I win I will be happy", "I would be happy if I won"
conjugate	to show the different forms of a verb according to voice, mood, tense, number andperson; conjugation is quite simple in English compared to many other languages eg: I walk, you walk, he/she/it walks, we walk, they walk; I walked, you walked, he/she/it walked, we walked, they walked
conjunction	word that joins or connects two parts of a sentence eg: Ram likes tea and coffee. Anthony went swimming although it was raining.
content word	word that has meaning in a sentence, such as a verb or noun (as opposed to astructure word, such as pronoun or auxiliary verb); content words are stressed in speech eg: "Could you BRING my GLASSES because I've LEFT them at HOME"
continuous (also called "progressive")	verb form (specifically an aspect) indicating actions that are in progress or continuing over a given time period (can be past, present or future); formed with "BE" + "VERB-ing" eg: "They are watching TV."
contraction	shortening of two (or more) words into one eg: isn't (is not), we'd've (we would have)
countable noun	thing that you can count, such as apple, pen, tree (see uncountable noun) eg: one apple, three pens, ten trees
dangling participle	illogical structure that occurs in a sentence when a writer intends to modify one thing but the reader attaches it to another eg: "Running to the bus, the flowers were blooming." (In the example sentence it seems that the flowers were running.)
declarative sentence	sentence type typically used to make a statement (as opposed to a question or command) eg: "Tara works hard", "It wasn't funny"
defining relative clause(also called "restrictive relative clause")	relative clause that contains information required for the understanding of the sentence; not set off with commas; see also non-defining clause eg: "The boy who was wearing a blue shirt was the winner"
demonstrative pronoun demonstrative adjective	pronoun or determiner that indicates closeness to (this/these) or distance from (that/those) the speaker eg: "This is a nice car", "Can you see those cars?"
dependent clause	part of a sentence that contains a subject and a verb but does not form a complete thought and cannot stand on its own; see also independent clause eg: "When the water came out of the tap..."