'has to be clarified' is correct and usable in written English.
You can use it when you want to express that something needs to be discussed or made more precise. Example sentence: His opinion on the matter has to be clarified before any decisions can be made.
"We need to look at less intrusive means," she said, adding, "Human beings have dignity and every measure has to be clarified first.
"It's extremely important and should be said because it has to be clarified".
So it has to be clarified if the streaming situation and the dust concentration situation at the position where the nozzle operates can get improved.
In addition, the aggregation mechanism has to be clarified to attain a full knowledge of the molecular basis of the elastic properties of natural nanostructured materials.
If so, this may explain the apparent higher transcript detection efficiency of the oligoarrays, and has to be clarified before absolute transcript concentrations can be interchanged across the technologies.
The finance director, Donal Buggy, said the use to which the proceeds from the South African sale will be put "still has to be clarified as part of the refinancing discussions".
"Even without Britain, neoliberal ideas dominate in Europe and one of the challenges for the EU will have to be not just to engage with the four fundamental freedoms [free movement of goods, capital, people and services], but also the question of how our welfare system in Europe has to be clarified.
Initially, it has to be clarified that the scenarios examined in this paper are retrospective.
In addition, the question has to be clarified whether alkenes are converted to ketones, in particular for the oil degrading yeast Candida maltosa little is known.
This assumption has to be clarified in further studies, however, this study has shown that surface hydrophobicity can be modified by means of various static pH levels.
Media captionNorbert Aul, RBC Capital markets: "The Spanish bailout has to be clarified further" The yield on benchmark 10-year bonds hit 7% in early trade, a level which many analysts believe is unsustainable in the long term.
