情态动词是否有时态
\u60c5\u6001\u52a8\u8bcd\u6709\u65f6\u6001\u4e48\u60c5\u6001\u52a8\u8bcd\u65e0\u4eba\u79f0\u548c\u6570\u7684\u53d8\u5316\uff0c\u4f46\u662f\u6709\u65f6\u6001\u7684\u53d8\u5316\uff0c\u4f60\u4e0a\u53e5\u4e2d\u7684needs\u540e\u9762\u63a5\u7684\u662f\u52a8\u8bcd\u539f\u5f62\uff0c\u6240\u4ee5needs\u662f\u9519\u8bef\u7684\uff0c\u5e94\u8be5\u53bb\u6389S\u3002
\u60c5\u6001\u52a8\u8bcd\u6ca1\u6709\u65f6\u6001\u53d8\u5316.
有,只有一般现在时和一般过去时两种时态can==could,will==would,may====might,have(has)to---had to ,must--must ,need---needed有
can,will的过去式为could,would.
be able to就有各种时态的表示法.(指后天所学会的某种技能).
通常情况下,情态动词只有过去式.
will-----would; shall----should; may----might;
can----could; have to-----had to
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