语 境 自 主 领 悟
先观察原句
后自主感悟
1.Many factors have influenced American pronunciation since the first settlers arrived four hundred years ago.
2.A Londoner has more difficulty understanding a Scotsman from Glasgow than understanding a New Yorker.
3.Some experts believe that the two varieties are moving closer together.
4.Users of English will all be able to understand each other — wherever they are.
1.句1用了现在完成时态，谓语动词的构成为：have/has＋done。
2.句2用了一般现在时态，当主语为第三人称单数时，谓语动词用第三人称单数形式。
3.句3用了现在进行时态，谓语动词的构成为：be(am/is/are)＋doing。
4.句4用了一般将来时态，谓语动词的构成为：will/shall＋do。
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