Read about Gerunds and Past Participles.
Then complete this exercise
Wednesday, September 29, 2010
Monday, September 27, 2010
"IT" as a subject
It -- as subject of a sentence
The Third Person It as Subject of a sentence
It as a subject of a sentence can be used in two different ways.
1). As an empty or meaningless word in expressions that concern the time or the weather:
It is one o'clock.
It is raining.
It will soon be supper time.
It is frosty.
2). As the formal subject of a sentence, referring to the deferred real subject that follows the verb:
It is useless to wait. (deferred subject - to wait)
It is a pity that you must go. (deferred subject - that you must go)
In sentences where it refers to a deferred subject, the latter can be moved to the normal position preceding the verb;
To wait is useless.
That you must go is a pity
The Third Person It as Subject of a sentence
It as a subject of a sentence can be used in two different ways.
1). As an empty or meaningless word in expressions that concern the time or the weather:
It is one o'clock.
It is raining.
It will soon be supper time.
It is frosty.
2). As the formal subject of a sentence, referring to the deferred real subject that follows the verb:
It is useless to wait. (deferred subject - to wait)
It is a pity that you must go. (deferred subject - that you must go)
In sentences where it refers to a deferred subject, the latter can be moved to the normal position preceding the verb;
To wait is useless.
That you must go is a pity
Sunday, September 19, 2010
Thursday, September 16, 2010
Monday, September 13, 2010
The Muscular System
READ THE TEXT CAREFULLY.
The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, where attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction. Exceptions to this are the action of cilia, the flagellum on sperm cells, and amoeboid movement of some white blood cells.
The integrated action of joints, bones, and skeletal muscles produces obvious movements such as walking and running. Skeletal muscles also produce more subtle movements that result in various facial expressions, eye movements, and respiration.
In addition to movement, muscle contraction also fulfills some other important functions in the body, such as posture, joint stability, and heat production. Posture, such as sitting and standing, is maintained as a result of muscle contraction. The skeletal muscles are continually making fine adjustments that hold the body in stationary positions. The tendons of many muscles extend over joints and in this way contribute to joint stability. This is particularly evident in the knee and shoulder joints, where muscle tendons are a major factor in stabilizing the joint. Heat production, to maintain body temperature, is an important by-product of muscle metabolism. Nearly 85 percent of the heat produced in the body is the result of muscle contraction.
The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, where attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction. Exceptions to this are the action of cilia, the flagellum on sperm cells, and amoeboid movement of some white blood cells.
The integrated action of joints, bones, and skeletal muscles produces obvious movements such as walking and running. Skeletal muscles also produce more subtle movements that result in various facial expressions, eye movements, and respiration.
In addition to movement, muscle contraction also fulfills some other important functions in the body, such as posture, joint stability, and heat production. Posture, such as sitting and standing, is maintained as a result of muscle contraction. The skeletal muscles are continually making fine adjustments that hold the body in stationary positions. The tendons of many muscles extend over joints and in this way contribute to joint stability. This is particularly evident in the knee and shoulder joints, where muscle tendons are a major factor in stabilizing the joint. Heat production, to maintain body temperature, is an important by-product of muscle metabolism. Nearly 85 percent of the heat produced in the body is the result of muscle contraction.
Sunday, September 12, 2010
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