一個英文句子可以有兩個動詞嗎？

dare在這是當助動詞用。
I dare say ... =我想.../我看（大概）....

p.351 《新世紀英漢辭典》
dare當助動詞：
Dare he fight? =他敢打架嗎？
He daren't tell us.=他不敢告訴我們。

Do you dare to ask her?=你敢問她嗎？（這裡的dare才是當主要動詞用）

daresay v. is used when saying or agreeing that something may perhaps be true.eg:-I dare say you are a patient.
I dare say ;spoken; is used when saying or agreeing that something may perhaps be true eg:-I dare say patient will come.
"that I am really a patient person"--------adv clause contains a subject and a verb which is usually only part of a sentence.Hence ,a verb can be added.Similarly, a sentence can have two verbs if in the form of "infinitive","participles", and "Gerund"