2017职称英语卫生类语法基本句型：主语+系动词+表语

1）系动词一般为be 动词。

注意：look, feel, sound, smell, taste, get, become, come, go, turn, grow,keep, seem, stand等词可以作"半系动词"用，按行为动词方式变化，起系动词的作用。

例如：

—— He felt the pockets thoroughly but did not find a single penny.（他摸遍了口袋但没有找到一分钱。—— feel为行为动词）

—— You look pale. Do you feel unwell? （你脸色苍白，感到不舒服？—— look/ feel为系动词） 一般来说，动词后面跟的是个形容词或名词，该动词为系动词，如：The plan sounds perfect. / The flower smells nice. / The dish tastesdelicious. / It is getting dark.

2）there be是英语中非常重要的一个句型：there是引导词，不解释 "那里"1473 这是个倒装句, 主语在be动词的后面, be动词的单复数由后面的主语决定。

注意难点：

There isn't enough furniture in the room.（房间里家具不够）

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

There is no doubt that smallpox has been wiped out in China.（毫无疑问，中国已消灭天花。）

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

There is ample evidence that AIDS is spreading quickly in Asia. （充分证据表明，爱滋病正在亚洲迅速蔓延。——同位语从句）

错：It is evidence thatAIDS is spreading quickly in Asia. （可以： It is evidentthat AIDS is spreading quickly in Asia. - 主语从句）