You can do it in pdflatex, but you need some work if you want to use Unicode characters.
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tipa}
\DeclareUnicodeCharacter{02C8}{\textprimstress}
\DeclareUnicodeCharacter{026A}{\textsci}
\DeclareUnicodeCharacter{0292}{\textyogh}
\DeclareUnicodeCharacter{0254}{\textopeno}
\DeclareUnicodeCharacter{02A4}{\textdyoghlig}
\begin{document}
\begin{tabular}{|c|c|c|c|}
\hline
Words & Phonetics & Students Pronounced & Source \\
\hline
Language & \textipa{/ˈlæŋgwɪʤ/} & \textipa{/ˈleŋgwɪʤ/} & S1,S2,S4,S5,S6\\
Important& \textipa{/ɪmˈpɔ:tnt/} & \textipa{/ɪmˈpɔ:tent/} & S1,S2,S3,S5,S8,S9\\
\hline
\end{tabular}
\end{document}
I fixed the symbols used.
In order to use Cyrillic letters, you have to enable them with fontenc, see https://tex.stackexchange.com/a/215678/4427

You can make the example compilable also with XeLaTeX:
\documentclass{article}
\usepackage{ifxetex}
\ifxetex
\usepackage{fontspec}
\setmainfont{CMU Serif}
\else
\usepackage[utf8]{inputenc}
\usepackage{tipa}
\fi
\ifxetex
\providecommand{\textipa}[1]{#1}
\else
\DeclareUnicodeCharacter{02C8}{\textprimstress}
\DeclareUnicodeCharacter{026A}{\textsci}
\DeclareUnicodeCharacter{0292}{\textyogh}
\DeclareUnicodeCharacter{0254}{\textopeno}
\DeclareUnicodeCharacter{02A4}{\textdyoghlig}
\fi
\begin{document}
\begin{tabular}{|c|c|c|c|}
\hline
Words & Phonetics & Students Pronounced & Source \\
\hline
Language & \textipa{/ˈlæŋgwɪʤ/} & \textipa{/ˈleŋgwɪʤ/} & S1,S2,S4,S5,S6\\
Important& \textipa{/ɪmˈpɔ:tnt/} & \textipa{/ɪmˈpɔ:tent/} & S1,S2,S3,S5,S8,S9\\
\hline
\end{tabular}
\end{document}
inputencpackage? – David Carlisle Nov 10 '17 at 15:26tipapackage for your phonetic symbols? It has a pretty comprehensive collection. Full documentation is here, or a list of phonetic symbols can be found in table 11 of the Comprehensive Symbol List. – Sandy G Nov 10 '17 at 15:31\documentclass, include all relevant\usepackagecommands, end with\end{document}and compile without errors, even if it does not produce your desired output. – Sandy G Nov 10 '17 at 15:39