關係詞，即體現句子之間關係的詞或詞組。也有不少人稱之爲信號詞，或者是連接詞。不管在雅思聽說讀寫四門中的任何一門都需要用到這類詞，以使得句子更加流暢，句意更加明晰。分析認爲，關係詞可分爲兩大類：
1. 同向關係詞
同向關係詞，即用上此類詞或詞組，句子內部或句子間的方向沒有發生改變，只是根據前面的句意進一步延伸和細化。將其歸納爲：
舉例關係詞：for example, for instance,e.g., such as, like, take sth for example.
類比關係詞：like,alike, similar, same,as
選擇，並列和遞進關係詞：or,either…or, and, as well,also, besides, apart from, in addition, what’s more,furthermore, moreover
因果關係詞：表示由引起的，後接原因的詞或詞組：because，be cause of，as a result of, as a consequence of, due to, result from, be attributed to, be contributed to, arise from, owing to, thanks to, in that
表示導致，後接結果的詞或者詞組：so, therefore, thus, as a result, as a consequence, lead to, result in, attribute to, contribute to, give rise to, bring about, generate
總結關係詞：in conclusion, to conclude,to sum up, in sum, all in all, in brief
2. 逆向關係詞
逆向關係詞，即用上此類詞或詞組，句子內部或句子間的方向發生改變，前後句子意思形成相反關係。總結髮現，這類詞包含：
否定關係詞：not,none, no, never, non-,dis-, un-, in-, im-, -less, few, little, hardly, barely,seldom, neither…nor
轉折和讓步關係詞：but,however, yet, nevertheless,nonetheless, in fact, actually, despite, in spite of, although, even though,though
對比關係詞：unlike,by contrast, in contrast, on the contrary, conversely
(注：以上各類關係詞中所舉的例子僅僅只是常見的一部分)