2017職稱英語衛(wèi)生類語法基本句型：主語+系動詞+表語

1）系動詞一般為be 動詞。

注意：look, feel, sound, smell, taste, get, become, come, go, turn, grow,keep, seem, stand等詞可以作"半系動詞"用，按行為動詞方式變化，起系動詞的作用。

例如：

—— He felt the pockets thoroughly but did not find a single penny.（他摸遍了口袋但沒有找到一分錢。—— feel為行為動詞）

—— You look pale. Do you feel unwell? （你臉色蒼白，感到不舒服？—— look/ feel為系動詞） 一般來說，動詞后面跟的是個形容詞或名詞，該動詞為系動詞，如：The plan sounds perfect. / The flower smells nice. / The dish tastesdelicious. / It is getting dark.

2）there be是英語中非常重要的一個句型：there是引導(dǎo)詞，不解釋 "那里"1473 這是個倒裝句, 主語在be動詞的后面, be動詞的單復(fù)數(shù)由后面的主語決定。

注意難點(diǎn)：

There isn't enough furniture in the room.（房間里家具不夠）

錯：There hasn't enough furniture in the room.

There is no doubt that smallpox has been wiped out in China.（毫無疑問，中國已消滅天花。）

錯：It is no doubt that smallpox has been wiped out in China.

There is ample evidence that AIDS is spreading quickly in Asia. （充分證據(jù)表明，愛滋病正在亞洲迅速蔓延。——同位語從句）

錯：It is evidence thatAIDS is spreading quickly in Asia. （可以： It is evidentthat AIDS is spreading quickly in Asia. - 主語從句）