"To try to write certain sentences is difficult"
The correct statements are 1, 2 and 3.
1) The sentence is correctly written. The pattern "to try to do something" is correct and can be used.
2) The sentence contains more than one infinitive. It contains two infinitive verbs. TO TRY and TO WRITE.
3) One infinitive is inside another infinitive phrase. "To try to write certain sentences" is an infinitive phrase, it functions as a noun because it is the subject of the sentences. So, the second TO INFINITIVE is inside the main infinitive phrase. (That is the reason why number 4 is not correct)
Answer:
The rock cycle is a process in which rocks are continuously changed between the three rock types (created in a volcano), (coming from material that sinks in liquid) and metamorphic. ... If the (materials that sink in liquids) are buried under further layers of (material that sinks in liquid), they can become lithified to produce a (coming from material that sinks in liquid) rock. Very hot liquid rock inside the Earth is produced when rocks are melted.
Because I happen to be a synesthete, most words and colors seem to have a specific feel to me, and are often followed by a certain image. The word 'joyful' is no exception at all. For me, it has a puerile, innocent feel about it. The image that follows is like an ambient sunset with glimmering patches of light dappling the horizon. It's different from being happy or content because, like I said before, 'joyful' is a bit more naive and childish. It's the difference between watching small children playing at the park - happy - to actually <em>being</em> one of those children - joyful. I hope this answered your question.
It would use complete sentences.
