beginning /bɪˈgɪn.ɪŋ/ /bɪˈɡɪnɪŋ/
start /stɑrt/ /stɑːt/
onset /ˈɑːnset/ /ˈɒnset/
at first /æt fɜrst/ /æt fɜːst/
first /fɜːrst/ /fɜːst/
at the beginning