1. These methods are to be described in the next chapter.<br>2. The methods that are to be described next were widely used some twenty<br>years ago.<br>3. The methods to be described are used in our laboratory.<br>4. Which method is to be chosen in this case?<br>5. The method to be chosen in any particular case depends on many factors.<br>6. X-ray analysis is to be applied to the study of this material.<br>7. If a material is to be bleached with chlorine it must be moistened.<br>8. The material to be bleached with chlorine should be moistened.
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