Constantly oriented axes - Not sure as I don't really know what it means. • The movement of the bulk of the particles - The 'the' may not be necessary depending on the context the phrase is used in. 1- Does these phrases need to be corrected in a formal text? • He always has to study • He has to always study 2- Which phrase is better in formal text? The first one. • We investigate the effect of sport, education and technology on the children's behavior • We investigate the effect of sport, the one of education and the one of technology on the children's behavior 3- Which sentence is better in a formal text? The first one. • In these figures, the first panel shows 4- Which one is better in this sentence? "shows" or "show". because figures is plural nouns while panel is a singular noun. Shows because it relates to the first panel which is singular and the subject of the verb. The panel is showing and not figures.

1: I dont believe that they need to be corrected. 2: I personally would go with the second option. 3: The first option would sound smoother and flow easier, so go with that one. 4: When I personally said that sentence out loud i said "In these figures, the first panel shows".