I think I can answer these questions, but I do not know how to explain my answers in a intelligent way, can anyone help?

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1. Which is the "odd one out" in each group, and why?

a. The baby's bottle.
The nation's struggle.
The teacher's absent.
The nurse's pay.
The government's defeat.

Why?

b. The plane was hi-jacked by a woman.
The tourists were attacked by a gang.
The soldier was hit by a bullet.
The trains collided by a river.
Three hundred people were killed by the earthquake.

Why?

c. She must have lost the address.
Alan must have been here too.
That must have been awful.
The thieves must have got in through the window.
I must have something to drink.

Why?

Are the ones with the letters your answers? If so, I disagree with them.

Be more clear on what your answers are then I'll know how to explain it better. (I have my own answers and reasons).

no, those are typos, the letters mean nothing.

You still didn't tell me your answers though. :-)

Certainly! I can help you explain the answers to these questions. Let's go through each group:

a. The odd one out in this group is "The nation's struggle." The rest of the phrases ("The baby's bottle," "The teacher's absent," "The nurse's pay," and "The government's defeat") follow the pattern of possessive noun + noun. However, "The nation's struggle" does not follow this pattern as "struggle" is not a possession of the noun "nation."

b. The odd one out in this group is "Three hundred people were killed by the earthquake." The rest of the phrases ("The plane was hi-jacked by a woman," "The tourists were attacked by a gang," "The soldier was hit by a bullet," and "The trains collided by a river") describe actions or events caused by a specific agent. However, the phrase about the earthquake does not involve a specific agent causing the action.

c. The odd one out in this group is "I must have something to drink." The rest of the phrases ("She must have lost the address," "Alan must have been here too," "That must have been awful," and "The thieves must have got in through the window") indicate a strong belief or speculation about a particular situation. However, the phrase about having something to drink is a statement of personal necessity rather than speculation.

To determine the odd ones out in each group, it is helpful to analyze the patterns or meanings of the phrases and compare them to the others in the group. By identifying the differences between the phrases and explaining the reasons behind them, you can intelligently explain why one phrase stands out from the others.