This paper is a synthetic study of English comparative sentences (i.e. the sentences containing such expressions as more...than and as...as), aiming to provide a useful guide or source material for busy classroom practitioners. Varieties of English comparative sentences are examined through the lenses of the following nine pairs of variables: (1) clausal/nonclausal comparison, (2) complete/incomplete comparison, (3) adjectival/adverbial comparison, (4) parallel/nonparallel comparison, (5) comparison of equality/inequality, (6) comparison for quantity/degree, (7) comparison between entities/states of affairs, (8) comparison on one/two scales, and (9) comparison of objectivity/assimilation. Syntactic behavior and semantic content of various comparative sentences are discussed in some important details. Finally, this paper concludes with a brief discussion of pedagogical implications.