1.託福寫作常見語法錯誤之句子缺少連詞
兩個句子之間不能只用逗號連接，要有連詞。
誤：My sister loves to dance，she is very good at it.
2.託福寫作常見語法錯誤之句式不平行
句子中並列的成分應該是相同的結構。
誤：I like to eat Japanese and eating Thai food.(eating-> eat)
誤：Teenagers are more influenced by their peers than their parents.(than their parents-> than by their parents)
3.託福寫作常見語法錯誤之句子不完整
句子缺少主語或謂語。
誤：Because some necessary procedures such as transporting the factories，modifying equipment or planting more trees.
4.託福寫作常見語法錯誤之句意重複或冗餘
誤：The low-priced car was inexpensive.(low-priced和inexpensive重複)
誤：personally，I believe what the newspaper prints.(personally和I believe重複)
5.託福寫作常見語法錯誤之時態，語態不一致
我們來看幾種常見錯誤(句例說明)：
She did not adapt to the environment, but with time passing by, they find him more and more 和him是怎麼個意思咧?
I shall use my father's experience as an example. My father went to Australia several years ago. He see many birds and animals.明明是過去，see怎麼穿越回來了?
The gift I made are very pretty. gift是單數啊，are是怎麼回事?
6.託福寫作常見語法錯誤之連詞類缺失
Successful men will have many places to live, a country house can provide a nice environment to relax, then it will be a new start point, but will not be an end one.
大家暫且忽略語法問題，且看這個句子。這個句子的第一個問題就是連詞缺失：在live和a country house之間原作者使用逗號銜接的，但是呢，逗號並不能代替and等連詞的.作用。因爲Successful men will have many places to live和a country house can provide a nice environment to relax都是兩個完整的句子，而沒有主從依附關係，所以必須得有連詞(and，but，therefore)等連接才能保證句子有效。
總結：
缺連詞的另一大原因是很多同學不知道什麼是連詞，什麼不是。and or but是最有名的三個連詞。但是！however, so, yet, nevertheless也是連詞！！！可以連接兩句句子！