语 境 自 主 领 悟
先观察原句
后自主感悟
①Antarctica is the coldest place on Earth.
②They called it AntiArktikos, or Antarctica.
③98% of the surface is covered permanently in the ice cap.
④To learn a foreign language well is not easy.
⑤Swimming is a good exercise.
⑥Whether he will come is doubtful.
1.①～⑥句中的黑体部分
在句中均作主语。
2.由④⑤⑥句可知，不定式、动名词、从句作主语时谓语动词通常要用单数形式。
⑦I hope to see you soon.
⑧He came in and sat down.
⑨The student went pale when he saw the teacher.
⑩I can easily tell my father's step.
?We hadn't walked far when we lost our way.
3.由⑦～?可知，黑体部分均为动词，⑦⑧句中的黑体部分可直接作谓语，而⑨⑩?句中黑体部分不能单独作谓语。
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