一个人拉扯四个孩子，想必很不容易。
It must not have been easy raising four children alone.
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must英 /mʌst/|美 /mʌst/
not英 /nɒt/|美 /nɑt/
been英 /biːn/|美 /bɪn/
解释
must not have been + adj 对过去处境做否定推断：说话人推断独自抚养四个孩子当时「不 easy」。
It must not have been easy raising four children alone.
must not have been + adj 对过去处境做否定推断：说话人推断独自抚养四个孩子当时「不 easy」。