Final answer:
The correct question tag for the statement 'The boat looked almost like a toy' is 'didn't it?', as it conforms to the rule of opposite polarity for forming question tags in English.
Step-by-step explanation:
The question tag for the sentence 'The boat looked almost like a toy' should be 'didn't it?', making the correct full sentence 'The boat looked almost like a toy, didn't it?'. Question tags are used in English to prompt confirmation from the listener and are formed based on the auxiliary verb and the not contraction ('n't') of the main verb in the sentence. Since 'looked' is the past simple form of 'to look' and is a positive statement, the question tag must be negative ('didn't it').