module3_unit2_grammar_and_usage

三．当句子的主语是动词不定式时,可使用it 作形式主语,而把动词不定式放在句尾.
三．当句子的主语是动词不定式时,可使用it 作形式主语,而把动词不定式放在句尾.
To master a foreign language is hard.
三．当句子的主语是动词不定式时,可使用it 作形式主语,而把动词不定式放在句尾.
Review the function of “it”
1. It’s a book.
(指代)
2. It’s over ten o’clock.
3. It’s raining outside.
4. It’s a long way to the museum.
Review the function of “it”
That we would not be able to understand Old English today is certain.
一．it形式主语的定义：其代替的是句子的 逻辑主语，并无实际意义，只是为满足语法 上的需要，避免句子头重脚轻。
That we would not be able to understand Old English today is certain. It is certain that we would not be able to understand Old English today.
一．it形式主语的定义：其代替的是句子的 逻辑主语，并无实际意义，只是为满足语法 上的需要，避免句子头重脚轻。
That we would not be able to understand Old English today is certain. It is certain that we would not be able to understand Old English today.
2. It’s over ten o’clock.
(பைடு நூலகம்间)
3. It’s raining outside.
(天气)
4. It’s a long way to the museum.
Review the function of “it”
1. It’s a book.
(指代)
2. It’s over ten o’clock.
二．it 作形式主语的句型
二．it 作形式主语的句型 1)It is＋名词（词组）(a pity/an honour/a fact/a good thing/no surprise/no wonder) +that 从句
二．it 作形式主语的句型 1)It is＋名词（词组）(a pity/an honour/a fact/a good thing/no surprise/no wonder) +that 从句 2)It is＋形容词 (obvious/true/natural/surprising/ funny/wonderful/possible/likely/ certain) +that 从句
三．当句子的主语是动词不定式时,可使用it 作形式主语,而把动词不定式放在句尾.
To master a foreign language is hard.
二．it 作形式主语的句型 1)It is＋名词（词组）(a pity/an honour/a fact/a good thing/no surprise/no wonder) +that 从句 2)It is＋形容词 (obvious/true/natural/surprising/ funny/wonderful/possible/likely/ certain) +that 从句 3)It is ＋过去分词 (said/reported/thought/decided/ expected/announced/arranged) +that从句
(时间)
3. It’s raining outside.
(天气)
4. It’s a long way to the museum.
(距离)
一．it形式主语的定义：其代替的是句子的 逻辑主语，并无实际意义，只是为满足语法 上的需要，避免句子头重脚轻。
一．it形式主语的定义：其代替的是句子的 逻辑主语，并无实际意义，只是为满足语法 上的需要，避免句子头重脚轻。
To master a foreign language is hard.
三．当句子的主语是动词不定式时,可使用it 作形式主语,而把动词不定式放在句尾.
To master a foreign language is hard.
It is hard to master a foreign language.
一．it形式主语的定义：其代替的是句子的 逻辑主语，并无实际意义，只是为满足语法 上的需要，避免句子头重脚轻。
That we would not be able to understand Old English today is certain. It is certain that we would not be able to understand Old English today.
1. It’s a book.
(指代)
2. It’s over ten o’clock.
(时间)
3. It’s raining outside.
4. It’s a long way to the museum.
Review the function of “it”
1. It’s a book.
(指代)
• Grammar and usage
连词
连接词 连接代词
that, whether, if,
what, whatever, who, whoever, whom, whose, which when, where, how, why
连接副词
Attention
1. 这些引导名词性从句的疑问词在名词性 从句中既起引导作用又在从句中作一定 的成分。 2. 名词性从句必须用陈述语序。 3. 在疑问词引导的名词性从句中，疑问词 不能省略。