Topic analysis about English clauses, English various clause analysis.

the temperature,__water freezes"means the temperature at which the water freezes, and the horizontal line part can be used"when"to replace it, if used"The form of preposition + which", the key is to look with the antecedent"the temperature"Collocation preposition what, here"at the temperature"It is habitual usage, so I choose A.

Generally speaking, the easiest way to make a definite clause is to bring the answer into the clause for testing, and here the clause part of the definite clause is"water freezes at the temperature", for, in, and with are obviously incorrect.

Here is a non-restrictive definite clause, some students have asked me before, temperatureTemperature water freezes, water freezes, connected is water freezes at a temperature, temperature is a point, so the preposition uses at, which represents the previous temperature.

The middle comma part can be understood as an example, but let's not look at it first, and the meaning of the remaining sentence is roughly as follows: Recent studies have shown how to use electric charges to change temperature. shown is a predicate verb, followed by a subject, that is, how clause, and how can be .

In the clause, temperature is the subject, can be changed is the verb part, and using means to pass. to change, and the whole sentence is easier to understand.

If you look at the four options, they are all in the form of prepositions plus which, which shows that the test is on non-restrictive definite clauses, which are generally the examination of fixed collocations of verbs. However, I think the choice of AT is related to the scope of examples, which means "taking water freezing as an example", personal understanding, for reference only, welcome.

Any grammar book has a very detailed one, so it's good to figure out the composition of the sentence first and analyze the components of the clause in the sentence.

The main thing is to see what components the clause does in the sentence, and what components are what the clause is.

It's available in many dictionaries, so read it for yourself.

An object clause is a clause that acts as an object in a sentence.

A definite clause is a clause that acts as an object in a sentence.

Is there anything wrong with this sentence???