The longer and less frequencyt English words are, the harder I memorize them. The longer and less frequent English words are, the harder I memorize them.

The longer and less frequencycommon English words are, the harder I work to memorize them. The longer and less common English words are, the harder I work to memorize them.

Although we speak of word frequency lists, it is doesn't work to say 'the less frequent words are...'. You would have to explain what you mean by frequent: e.g. 'the less frequently they appear in texts'

If I havmake mistakes inwith English articles, some native speakers kindly suggest easier ways to describe them. If I make mistakes with English articles, some native speakers kindly suggest easier ways to describe them.

If I havWhen I make mistakes inwith English articlewords, some native speakers kindly suggest easier way to describthat I use easier English words to say the same theming. When I make mistakes with English words, some native speakers kindly suggest that I use easier English words to say the same thing.

However, the alternative words are sometimes hard to memorizelearn too. However, the alternative words are sometimes hard to learn too.

For example, "postpone" can be replaced with "put off", which seems obliviously easier to memorize. For example, "postpone" can be replaced with "put off", which seems obviously easier to memorize.

For example, "postpone" can be replaced with "put off", which seems obliviouslyto be easier to memorize. For example, "postpone" can be replaced with "put off", which seems to be easier to memorize.

You mean 'obviously'. Obliviously is a completely different word (meaning completely unaware of something). Obvious isn't wrong in that context. It just didn't sound right. And I think you're trying to say that 'put off' seems like it should be easier to memorize'. Whether that's obvious to everyone isn't really the point.

But, I can't make up my mind which combinations of simple verbs and prepositions to choose. But, I can't make up my mind which combinations of simple verbs and prepositions to choose.

But, I can't make up my mind which combinations of simple verb and preposition to choose. But, I can't make up my mind which combinations of simple verb and preposition to choose.

I don't really see how this follows. You're talking generally about using simpler words to replace words that are hard to learn, and then suddenly you are speaking specifically about verbs and prepositions. Your example was indeed a verb, but your discussion of it didn't suggest you were only talking about verbs and prepositions. And I don't think you would choose verbs-preposition combinations; you would choose the words you find difficult to memorize and look for simpler synonyms, which might or might not be verb-preposition combinations.