Which of the following does not contain a linking verb?
We have to find out a sentence, which doesn't have a linking verb. In order to find out the linking verb, we must understand it's meaning and usage. Linking verbs are used to link the subject with it's complement/state or adjective. For example: Roshni is pale. 'Roshni' is the subject and 'pale' defines her state, these two are connected by a linking verb 'is'.
Option A - 'Joshua felt happy.' Here, the subject 'Joshua' is connected with his state of being 'happy', by the linking verb 'felt'. Hence, 'felt' is the linking verb in this sentence. Thus, option A is incorrect.
Option B - 'Does the tea taste too sweet?' Here, the subject 'the tea' is linked with its adjective or complement 'sweet' by the linking verb 'taste'. Hence, 'taste' is the linking verb in this sentence. Thus, option B is incorrect.
Option C - 'They were partners.' Here, the subject 'they' is linked with its complement 'partners' by the linking verb 'were'. Hence, 'were' is the linking verb in this sentence. Thus, option C is incorrect.
Option D - She looked into the matter.' Here, 'looked' is an ordinary verb that describes the action of the subject, and it doesn't link the subject with its complement. Hence, this sentence doesn't have a linking verb. Thus, option D is the correct answer.