英语词型转换答:soften, shorten, widen, threaten, sharpen.3. en + n. ---v. 使成为...endanger, enjoy, enlarge, enrich, enable,4. n. /adj. +fy---vt. 使…beautify, specify, simplify,变成名词 --ment: movement, development, payment, retirement, excite, attach ---ness: 抽象名词,状态,性...