一、tendenly写法错误，正确写法是tendency，造句如下：
Today there is a tendency for people to opt out of social activity.
现在,越来越多的人倾向于不参加社会活动。
They tried to stop the tendency of inflation.
他们设法阻止住了通货膨胀的势头。
She has artistic tendencies.
她有艺术气质。
She has a strong natural tendency towards caution.
她天生喜欢小心谨慎。
二、tendency解析如下：
1、音标： 英 ['tendənsi] 美 ['tendənsi]
2、意思：
n. 趋势；倾向；秉性
3、词语搭配：
correct a tendency 纠正倾向
observe a tendency 观察趋势
downward tendency 下降的趋势
the current tendency 眼下的倾向
the universal tendency 普遍的倾向
the tendency in English teaching 英语教学趋势
the tendency to perfection 臻于完美的倾向
4、用法：
1）tendency指倾向，趋势;（话或作品等的）旨趣，意向;性情;癖好。
例句：I have a tendency to talk too much when I'm nervous.我紧张时总爱唠叨。
2）tendency也指固有或习得的倾向性，强调没有外来的影响或干扰，一般指的是人有某种倾向性或者某种趋势。
例如：He had a tendency to shrink up whenever attention was focused on him.当别人注意他时，他就会退缩一旁。
5、例句：
There is a tendency towards regional cooperation.
有一种地区性合作的趋势。
There is a growing tendency for people to work at home instead of in offices.
人们在家里而不是在办公室里工作的趋势日益增长。
I have a tendency to talk too much when I'm nervous.
我紧张时总爱唠叨。