Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
drab – adj. not bright or colorful
disappointed – adj. feeling sad, unhappy, or displeased because something was not as good as expected
phrase – n. a group of two or more words that express an idea but do not usually form a complete sentence
clause – n. a part of a sentence with its own subject and verb
verb tense – n. a form of a verb that is used to show when an action happened
modal verb - a verb (such as can or should) that is used with another verb to express possibility, necessity or permission
negative – adj. expressing denial or refusal
