一般来讲，however表示转折，放在句首，后面引起一整句话，是副词词性。但是为了引起文章句子节奏的变化，however经常放在句中(主谓之间)或句末来使用，体现副词的灵活性。
请看例子：
however放在句首：
Onaverage, 11% of all households, comprising almost two million people, were inthis position. However,those consisting of only one parent or a single adult had almost double thisproportion of poor people, with 21% and 19% respectively.
托福作文中however的妙用-However放在句中(主谓之间)：
Somepeople prefer to spend their lives doing the same things and avoiding change.Others, however,think that change is always a good thing.
As faras I am concerned,however, young men ought to be inspired to undertake a leadership rolein an organization.
Fromopponents’ perspective,however,little has been done by celebrities to help address theproblems.
托福作文中however的妙用-However放在从句主谓之间：
Otherfactors responsible for the growing crime rate include poor education, which however is also mainlythe result of poverty.
Highbuildings better suit large cities than houses, which however are more livable.
托福作文中however的妙用-However放在句末：
Thuswe can see that more men than women hold qualifications at the lower and higherlevels of education, while more women reach undergraduate diploma level thanmen. The gender difference is smallest at the level of Bachelor’s degree, however.(C4T3Task1考官范文)
托福作文中however的妙用-However还可以和分号连用来拉长句子：
So manydifferent sorts of tools enable people to live a highly efficient life;however, they are very likelyto cause threats to the environment.
Comparedto individuals, governments have more power to arrange a wide range of socialresources to address severe issues; however, it does not mean that addressing this problem totallydepends on governments.
Somepeople claim that it is acceptable and understandable; however,from my perspective, spendingenormous time on computer games instead of sports is a negative developmentboth for children’s growth and harmonious society.
推荐阅读：