英语作文中常用的句式变化的运用有：简单句转化为并列句或复合句;主动态转化为被动态;陈述转为倒装;一般句转化为强调句;肯定转化为反义词表达或双重否定;状语从句转化为分词短语作状语;定语从句转化为分词短语作定语等等。
英语短文优秀演讲稿范文一：
economic development and envir.
some people believe that economic development should never be at the cost of the environment. they think the present serious environmental problems are largely caused by rapid
economic development. for example, land resources are shrinking because of the industrial development and the expansion of cities. deserts are spreading because of over grazing, poor fanning, tree cutting, and strip mining. our air and water supplies are being polluted by poisonous gassesand waste products. it is important, therefore, that we should take another look at the way in which our industries and cities are developing.
however, other people think it unnecessary to consider environmental problems now and our first priority should always be given to economic development. they believe that environmental problems are inevitable and unavoidable in the process of economic development. they are only the by products of economic development, which can be dealt with later when we have the time and money.
i think the second idea is completelywrong. our ultimate aim in economic development is to provide a comfortable and happy life for our people. what is the point of economic development if we achieve it at the cost of our environment? there has been much evidence to prove that a balance between the two helps more rapid and continuous development.
英语短文优秀演讲稿范文二：
what is happiness?
happiness means different things to different people. for example, some people believe that if they have lots of money, they will be happy. they believe that if they are wealthy, they will be able to do anything they want, which means happiness. on the other hand, some people believe that holding a high position
in the government is happiness. in this way, you have not onlymoney, but also many other things which can't be bought by money.
however, other people believe that having lots of money is not happiness nor is holding a high position in the government. these people value their beliefs, or their intelligence, or their health. they think these can make them happy.
for me, happiness is closely tied to my studies, my work and my family. when i made great progress in my studies, when i made contributions to the society through my work, when all the members in my family live in harmony, sharing good and sad times, i was happy. although the definition of happiness depends on each individual my "wealth" of happiness is in my studies, my work, and my family.
英语短文优秀演讲稿范文三：
the importance of goal
why is goal-setting important? because goals can help you do and experience every meaningful thing you hope for in life. instead of letting life happen to you, goals allow you to make your life happen.
successful people have visions of what their life should be and they set lots of goals, both sbort-term and long-range, to help them realize the visions. by setting goals you are taking control of your life. it is like having a map to show where you want to go. a driver with an aim arrives at the destination without any waste of time or wrong turns. on the contrary, a driver with no aim drives aimlessly around, never getting anywhere and just using up gas and oil. winners in life set goals and follow through on them. they decide what they want and then get there by making plans and setting goals. goals ara not difficult to set and they are not difficult to reach. it is up to you to find out what your goals, ideals and visions really are. with a clear direction, and with certain plans, you will straightly get what you want.
without a goal, you have to live a passive life. you do not know where to go, what you want and why you are listless. then your life be comes dull and meaningless just like the dead water in a muddy lake.