Помогите пожалуйста по английскому, нужно в тексте подчеркнуть модальный глагол и его эквивалент.
Electrolyte capacitors can operate without a change only at temperatures not lower than -40 C. Power loss in a line should not exceed a definite value. The shunt motor may be called a constant speed motor. The importance of semiconductors in our life can"t be overestimated.