All linguistic analyses of the Khasi language thus far have been of a general nature ignoring many syntactically relevant issues, leave alone that of embedded clauses. The aim of this thesis is to bridge this gap by providing a good descriptive analysis of complement clauses, relative clauses and adverbial clauses of Khasi. Our discussion mainly revolves around the particle 'ba'. This particle is found in all the types of clauses that we discuss here. It is a complementizer in that it acts as a subordinator in complement clauses. It is an adjectival marker when it occurs with adjectives, an adjectivalizer when it occurs with verbs and a clause initiator or introducer in relative clauses. Our finding is that the complementizer ba is not a 'quotative' but has a multi-purpose role to play similar to that of the quotative in other South Asian languages. Khasi has both finite and non-finite complement clauses, though it lacks the category of the infinitive and consequently PRO. In this study we have shown that relative clauses in Khasi are post-nominal external relative clauses and the language does not have relative pronouns contrary to the claim of other scholars. The so-called relative pronouns are nothing but resumptive pronouns that are raised to the initial position of the embedded clause. This work also seeks to explain why the word order in adverbial clauses in Khasi is different from that of the main clause especially in cases where the subject of the subordinate clause and the subject of the main clause are understood to be different.